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    <link:label id="lab_lii_CommercialHeatingAndCoolingMember_FF3A7ACA2B4EDCB5D5052D5B8DA500FF_terseLabel_en-US" xlink:label="lab_lii_CommercialHeatingAndCoolingMember_FF3A7ACA2B4EDCB5D5052D5B8DA500FF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Commercial Heating and Cooling [Member]</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetIncomeLoss_FD54C156178314CF8C1C2D5B8B0BD719" xlink:to="lab_us-gaap_NetIncomeLoss_FD54C156178314CF8C1C2D5B8B0BD719" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_1259F4EC172B9C4EEE962D5B8B0CB9A0_negatedLabel_en-US" xlink:label="lab_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_1259F4EC172B9C4EEE962D5B8B0CB9A0" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Add: Loss from discontinued operations</link:label>
    <link:label id="lab_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_1259F4EC172B9C4EEE962D5B8B0CB9A0_label_en-US" xlink:label="lab_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_1259F4EC172B9C4EEE962D5B8B0CB9A0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_1259F4EC172B9C4EEE962D5B8B0CB9A0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_1259F4EC172B9C4EEE962D5B8B0CB9A0" xlink:to="lab_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_1259F4EC172B9C4EEE962D5B8B0CB9A0" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncomeLossFromContinuingOperations_6BD71527D3B07D29536E2D5B8B0C7E1F_totalLabel_en-US" xlink:label="lab_us-gaap_IncomeLossFromContinuingOperations_6BD71527D3B07D29536E2D5B8B0C7E1F" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Income from continuing operations</link:label>
    <link:label id="lab_us-gaap_IncomeLossFromContinuingOperations_6BD71527D3B07D29536E2D5B8B0C7E1F_label_en-US" xlink:label="lab_us-gaap_IncomeLossFromContinuingOperations_6BD71527D3B07D29536E2D5B8B0C7E1F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeLossFromContinuingOperations" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperations_6BD71527D3B07D29536E2D5B8B0C7E1F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperations_6BD71527D3B07D29536E2D5B8B0C7E1F" xlink:to="lab_us-gaap_IncomeLossFromContinuingOperations_6BD71527D3B07D29536E2D5B8B0C7E1F" xlink:type="arc" />
    <link:label id="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_FE63DB8F1BD397CA35692D5B8B0CE817_terseLabel_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_FE63DB8F1BD397CA35692D5B8B0CE817" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Weighted-average shares outstanding &#8211; basic</link:label>
    <link:label id="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_FE63DB8F1BD397CA35692D5B8B0CE817_label_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_FE63DB8F1BD397CA35692D5B8B0CE817" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weighted Average Number of Shares Outstanding, Basic</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_FE63DB8F1BD397CA35692D5B8B0CE817" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_FE63DB8F1BD397CA35692D5B8B0CE817" xlink:to="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_FE63DB8F1BD397CA35692D5B8B0CE817" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_DDC7B98A08CC80B991F22D5B8B0C9264_verboseLabel_en-US" xlink:label="lab_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_DDC7B98A08CC80B991F22D5B8B0C9264" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Add: Potential effect of dilutive securities attributable to stock-based payments</link:label>
    <link:label id="lab_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_DDC7B98A08CC80B991F22D5B8B0C9264_label_en-US" xlink:label="lab_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_DDC7B98A08CC80B991F22D5B8B0C9264" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_DDC7B98A08CC80B991F22D5B8B0C9264" xlink:to="lab_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_DDC7B98A08CC80B991F22D5B8B0C9264" xlink:type="arc" />
    <link:label id="lab_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_F3ADC43A8ABFBD5DA2772D5B8B0C2D13_totalLabel_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_F3ADC43A8ABFBD5DA2772D5B8B0C2D13" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Weighted-average shares outstanding &#8211; diluted</link:label>
    <link:label id="lab_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_F3ADC43A8ABFBD5DA2772D5B8B0C2D13_label_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_F3ADC43A8ABFBD5DA2772D5B8B0C2D13" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weighted Average Number of Shares Outstanding, Diluted</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_F3ADC43A8ABFBD5DA2772D5B8B0C2D13" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_F3ADC43A8ABFBD5DA2772D5B8B0C2D13" xlink:to="lab_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_F3ADC43A8ABFBD5DA2772D5B8B0C2D13" xlink:type="arc" />
    <link:label id="lab_us-gaap_EarningsPerShareBasicAbstract_5CC69BBAC981458951892D5B8B0DB715_verboseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareBasicAbstract_5CC69BBAC981458951892D5B8B0DB715" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Earnings per share &#8211; Basic:</link:label>
    <link:label id="lab_us-gaap_EarningsPerShareBasicAbstract_5CC69BBAC981458951892D5B8B0DB715_label_en-US" xlink:label="lab_us-gaap_EarningsPerShareBasicAbstract_5CC69BBAC981458951892D5B8B0DB715" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Earnings Per Share, Basic [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EarningsPerShareBasicAbstract" xlink:label="loc_us-gaap_EarningsPerShareBasicAbstract_5CC69BBAC981458951892D5B8B0DB715" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EarningsPerShareBasicAbstract_5CC69BBAC981458951892D5B8B0DB715" xlink:to="lab_us-gaap_EarningsPerShareBasicAbstract_5CC69BBAC981458951892D5B8B0DB715" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncomeLossFromContinuingOperationsPerBasicShare_3E1BD38F6D64A7F983CE2D5B8B0D2877_verboseLabel_en-US" xlink:label="lab_us-gaap_IncomeLossFromContinuingOperationsPerBasicShare_3E1BD38F6D64A7F983CE2D5B8B0D2877" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Income from continuing operations (in dollars per share)</link:label>
    <link:label id="lab_us-gaap_IncomeLossFromContinuingOperationsPerBasicShare_3E1BD38F6D64A7F983CE2D5B8B0D2877_label_en-US" xlink:label="lab_us-gaap_IncomeLossFromContinuingOperationsPerBasicShare_3E1BD38F6D64A7F983CE2D5B8B0D2877" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income (Loss) from Continuing Operations, Per Basic Share</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsPerBasicShare" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsPerBasicShare_3E1BD38F6D64A7F983CE2D5B8B0D2877" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsPerBasicShare_3E1BD38F6D64A7F983CE2D5B8B0D2877" xlink:to="lab_us-gaap_IncomeLossFromContinuingOperationsPerBasicShare_3E1BD38F6D64A7F983CE2D5B8B0D2877" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare_8FAFA5F90D3CA79F296C2D5B8B0D6C94_verboseLabel_en-US" xlink:label="lab_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare_8FAFA5F90D3CA79F296C2D5B8B0D6C94" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Loss from discontinued operations (in dollars per share)</link:label>
    <link:label id="lab_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare_8FAFA5F90D3CA79F296C2D5B8B0D6C94_label_en-US" xlink:label="lab_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare_8FAFA5F90D3CA79F296C2D5B8B0D6C94" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare_8FAFA5F90D3CA79F296C2D5B8B0D6C94" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare_8FAFA5F90D3CA79F296C2D5B8B0D6C94" xlink:to="lab_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare_8FAFA5F90D3CA79F296C2D5B8B0D6C94" xlink:type="arc" />
    <link:label id="lab_us-gaap_EarningsPerShareBasic_A1C71EF8846E78BC68282D5B8B0D5499_totalLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareBasic_A1C71EF8846E78BC68282D5B8B0D5499" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net income (in dollars per share)</link:label>
    <link:label id="lab_us-gaap_EarningsPerShareBasic_A1C71EF8846E78BC68282D5B8B0D5499_label_en-US" xlink:label="lab_us-gaap_EarningsPerShareBasic_A1C71EF8846E78BC68282D5B8B0D5499" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Earnings Per Share, Basic</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EarningsPerShareBasic" xlink:label="loc_us-gaap_EarningsPerShareBasic_A1C71EF8846E78BC68282D5B8B0D5499" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EarningsPerShareBasic_A1C71EF8846E78BC68282D5B8B0D5499" xlink:to="lab_us-gaap_EarningsPerShareBasic_A1C71EF8846E78BC68282D5B8B0D5499" xlink:type="arc" />
    <link:label id="lab_us-gaap_EarningsPerShareDilutedAbstract_C49FB367075115A884652D5B8B0EF034_verboseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareDilutedAbstract_C49FB367075115A884652D5B8B0EF034" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Earnings per share &#8211; Diluted:</link:label>
    <link:label id="lab_us-gaap_EarningsPerShareDilutedAbstract_C49FB367075115A884652D5B8B0EF034_label_en-US" xlink:label="lab_us-gaap_EarningsPerShareDilutedAbstract_C49FB367075115A884652D5B8B0EF034" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Earnings Per Share, Diluted [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EarningsPerShareDilutedAbstract" xlink:label="loc_us-gaap_EarningsPerShareDilutedAbstract_C49FB367075115A884652D5B8B0EF034" xlink:type="locator" />
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    <link:label id="lab_us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare_C76B2D4287960CF0EE3E2D5B8B0E710C_verboseLabel_en-US" xlink:label="lab_us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare_C76B2D4287960CF0EE3E2D5B8B0E710C" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Income from continuing operations (in dollars per share)</link:label>
    <link:label id="lab_us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare_C76B2D4287960CF0EE3E2D5B8B0E710C_label_en-US" xlink:label="lab_us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare_C76B2D4287960CF0EE3E2D5B8B0E710C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income (Loss) from Continuing Operations, Per Diluted Share</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare_C76B2D4287960CF0EE3E2D5B8B0E710C" xlink:to="lab_us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare_C76B2D4287960CF0EE3E2D5B8B0E710C" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare_A572285BC03B1DDFB96D2D5B8B0EA4BB_verboseLabel_en-US" xlink:label="lab_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare_A572285BC03B1DDFB96D2D5B8B0EA4BB" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Loss from discontinued operations (in dollars per share)</link:label>
    <link:label id="lab_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare_A572285BC03B1DDFB96D2D5B8B0EA4BB_label_en-US" xlink:label="lab_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare_A572285BC03B1DDFB96D2D5B8B0EA4BB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare_A572285BC03B1DDFB96D2D5B8B0EA4BB" xlink:type="locator" />
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    <link:label id="lab_us-gaap_OperatingLeaseRightOfUseAsset_68A85DAD30DBFBBD96FE36F2FFABAF1D_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseRightOfUseAsset_68A85DAD30DBFBBD96FE36F2FFABAF1D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating lease right-of-use assets</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_68A85DAD30DBFBBD96FE36F2FFABAF1D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseRightOfUseAsset_68A85DAD30DBFBBD96FE36F2FFABAF1D" xlink:to="lab_us-gaap_OperatingLeaseRightOfUseAsset_68A85DAD30DBFBBD96FE36F2FFABAF1D" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityCurrent_A59FF518FC4D4A7F81BF36F2FFAB5EC7_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityCurrent_A59FF518FC4D4A7F81BF36F2FFAB5EC7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Finance lease liability, current</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityCurrent_A59FF518FC4D4A7F81BF36F2FFAB5EC7_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityCurrent_A59FF518FC4D4A7F81BF36F2FFAB5EC7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Liability, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FinanceLeaseLiabilityCurrent" xlink:label="loc_us-gaap_FinanceLeaseLiabilityCurrent_A59FF518FC4D4A7F81BF36F2FFAB5EC7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityCurrent_A59FF518FC4D4A7F81BF36F2FFAB5EC7" xlink:to="lab_us-gaap_FinanceLeaseLiabilityCurrent_A59FF518FC4D4A7F81BF36F2FFAB5EC7" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityNoncurrent_58EAE5BBD4B10162951336F2FFAB3E47_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityNoncurrent_58EAE5BBD4B10162951336F2FFAB3E47" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Finance lease liability, non-current</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseLiabilityNoncurrent_58EAE5BBD4B10162951336F2FFAB3E47_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityNoncurrent_58EAE5BBD4B10162951336F2FFAB3E47" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Liability, Noncurrent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FinanceLeaseLiabilityNoncurrent" xlink:label="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_58EAE5BBD4B10162951336F2FFAB3E47" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_58EAE5BBD4B10162951336F2FFAB3E47" xlink:to="lab_us-gaap_FinanceLeaseLiabilityNoncurrent_58EAE5BBD4B10162951336F2FFAB3E47" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeaseLiabilityCurrent_35808E460E21A165290636F2FFAB3889_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilityCurrent_35808E460E21A165290636F2FFAB3889" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating lease liability, current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseLiabilityCurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_35808E460E21A165290636F2FFAB3889" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseLiabilityCurrent_35808E460E21A165290636F2FFAB3889" xlink:to="lab_us-gaap_OperatingLeaseLiabilityCurrent_35808E460E21A165290636F2FFAB3889" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeaseLiabilityNoncurrent_91B00ED855C83FD6E2B936F2FFACC880_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilityNoncurrent_91B00ED855C83FD6E2B936F2FFACC880" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating lease liability, non-current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_91B00ED855C83FD6E2B936F2FFACC880" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_91B00ED855C83FD6E2B936F2FFACC880" xlink:to="lab_us-gaap_OperatingLeaseLiabilityNoncurrent_91B00ED855C83FD6E2B936F2FFACC880" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_4DCF9A8BF698C3BF551B36F2FFADAB15_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_4DCF9A8BF698C3BF551B36F2FFADAB15" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Weighted-average remaining lease term - finance leases</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_4DCF9A8BF698C3BF551B36F2FFADAB15_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_4DCF9A8BF698C3BF551B36F2FFADAB15" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Weighted Average Remaining Lease Term</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1" xlink:label="loc_us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_4DCF9A8BF698C3BF551B36F2FFADAB15" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_4DCF9A8BF698C3BF551B36F2FFADAB15" xlink:to="lab_us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_4DCF9A8BF698C3BF551B36F2FFADAB15" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_D02F5554CC0B15697A6A36F2FFADD5F1_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_D02F5554CC0B15697A6A36F2FFADD5F1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Weighted-average remaining lease term - operating leases</link:label>
    <link:label id="lab_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_D02F5554CC0B15697A6A36F2FFADD5F1_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_D02F5554CC0B15697A6A36F2FFADD5F1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Lease, Weighted Average Remaining Lease Term</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_D02F5554CC0B15697A6A36F2FFADD5F1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_D02F5554CC0B15697A6A36F2FFADD5F1" xlink:to="lab_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_D02F5554CC0B15697A6A36F2FFADD5F1" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent_AC028E9660A2F66CFCA736F2FFAD11E3_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent_AC028E9660A2F66CFCA736F2FFAD11E3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Weighted-average discount rate - finance leases</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent_AC028E9660A2F66CFCA736F2FFAD11E3_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent_AC028E9660A2F66CFCA736F2FFAD11E3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Weighted Average Discount Rate, Percent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent" xlink:label="loc_us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent_AC028E9660A2F66CFCA736F2FFAD11E3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent_AC028E9660A2F66CFCA736F2FFAD11E3" xlink:to="lab_us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent_AC028E9660A2F66CFCA736F2FFAD11E3" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_36A181D20BD9DF6307BE36F2FFAD2C95_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_36A181D20BD9DF6307BE36F2FFAD2C95" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Weighted-average discount rate &#8211; operating leases</link:label>
    <link:label id="lab_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_36A181D20BD9DF6307BE36F2FFAD2C95_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_36A181D20BD9DF6307BE36F2FFAD2C95" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Lease, Weighted Average Discount Rate, Percent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_36A181D20BD9DF6307BE36F2FFAD2C95" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_36A181D20BD9DF6307BE36F2FFAD2C95" xlink:to="lab_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_36A181D20BD9DF6307BE36F2FFAD2C95" xlink:type="arc" />
    <link:label id="lab_lii_AreaOfLeasedOfficeBuilding_E08478EC830F3D187DFF36F2FFAE22A3_terseLabel_en-US" xlink:label="lab_lii_AreaOfLeasedOfficeBuilding_E08478EC830F3D187DFF36F2FFAE22A3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Area of Leased Office Building</link:label>
    <link:label id="lab_lii_AreaOfLeasedOfficeBuilding_E08478EC830F3D187DFF36F2FFAE22A3_label_en-US" xlink:label="lab_lii_AreaOfLeasedOfficeBuilding_E08478EC830F3D187DFF36F2FFAE22A3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Area of Leased Office Building</link:label>
    <link:label id="lab_lii_AreaOfLeasedOfficeBuilding_E08478EC830F3D187DFF36F2FFAE22A3_documentation_en-US" xlink:label="lab_lii_AreaOfLeasedOfficeBuilding_E08478EC830F3D187DFF36F2FFAE22A3" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Area of Leased Office Building</link:label>
    <link:loc xlink:href="lii-20190331.xsd#lii_AreaOfLeasedOfficeBuilding" xlink:label="loc_lii_AreaOfLeasedOfficeBuilding_E08478EC830F3D187DFF36F2FFAE22A3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_lii_AreaOfLeasedOfficeBuilding_E08478EC830F3D187DFF36F2FFAE22A3" xlink:to="lab_lii_AreaOfLeasedOfficeBuilding_E08478EC830F3D187DFF36F2FFAE22A3" xlink:type="arc" />
    <link:label id="lab_lii_PurchasePriceOfPropertyAtEndOfLeaseTerm_3A4D78E8D893974743E036F2FFAEF13E_terseLabel_en-US" xlink:label="lab_lii_PurchasePriceOfPropertyAtEndOfLeaseTerm_3A4D78E8D893974743E036F2FFAEF13E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Purchase Price of Property at End of Lease Term</link:label>
    <link:label id="lab_lii_PurchasePriceOfPropertyAtEndOfLeaseTerm_3A4D78E8D893974743E036F2FFAEF13E_label_en-US" xlink:label="lab_lii_PurchasePriceOfPropertyAtEndOfLeaseTerm_3A4D78E8D893974743E036F2FFAEF13E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Purchase Price of Property at End of Lease Term</link:label>
    <link:label id="lab_lii_PurchasePriceOfPropertyAtEndOfLeaseTerm_3A4D78E8D893974743E036F2FFAEF13E_documentation_en-US" xlink:label="lab_lii_PurchasePriceOfPropertyAtEndOfLeaseTerm_3A4D78E8D893974743E036F2FFAEF13E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Purchase Price of Property at End of Lease Term</link:label>
    <link:loc xlink:href="lii-20190331.xsd#lii_PurchasePriceOfPropertyAtEndOfLeaseTerm" xlink:label="loc_lii_PurchasePriceOfPropertyAtEndOfLeaseTerm_3A4D78E8D893974743E036F2FFAEF13E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_lii_PurchasePriceOfPropertyAtEndOfLeaseTerm_3A4D78E8D893974743E036F2FFAEF13E" xlink:to="lab_lii_PurchasePriceOfPropertyAtEndOfLeaseTerm_3A4D78E8D893974743E036F2FFAEF13E" xlink:type="arc" />
    <link:label id="lab_lii_PercentageOfLeaseBalanceAsFinalPaymentEndOfLeaseTerm_1B49927A14D038E5FBCA36F2FFAEE998_terseLabel_en-US" xlink:label="lab_lii_PercentageOfLeaseBalanceAsFinalPaymentEndOfLeaseTerm_1B49927A14D038E5FBCA36F2FFAEE998" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentage of Lease Balance as Final Payment End of Lease Term</link:label>
    <link:label id="lab_lii_PercentageOfLeaseBalanceAsFinalPaymentEndOfLeaseTerm_1B49927A14D038E5FBCA36F2FFAEE998_label_en-US" xlink:label="lab_lii_PercentageOfLeaseBalanceAsFinalPaymentEndOfLeaseTerm_1B49927A14D038E5FBCA36F2FFAEE998" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Percentage of Lease Balance as Final Payment End of Lease Term</link:label>
    <link:label id="lab_lii_PercentageOfLeaseBalanceAsFinalPaymentEndOfLeaseTerm_1B49927A14D038E5FBCA36F2FFAEE998_documentation_en-US" xlink:label="lab_lii_PercentageOfLeaseBalanceAsFinalPaymentEndOfLeaseTerm_1B49927A14D038E5FBCA36F2FFAEE998" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Percentage of Lease Balance as Final Payment End of Lease Term</link:label>
    <link:loc xlink:href="lii-20190331.xsd#lii_PercentageOfLeaseBalanceAsFinalPaymentEndOfLeaseTerm" xlink:label="loc_lii_PercentageOfLeaseBalanceAsFinalPaymentEndOfLeaseTerm_1B49927A14D038E5FBCA36F2FFAEE998" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_lii_PercentageOfLeaseBalanceAsFinalPaymentEndOfLeaseTerm_1B49927A14D038E5FBCA36F2FFAEE998" xlink:to="lab_lii_PercentageOfLeaseBalanceAsFinalPaymentEndOfLeaseTerm_1B49927A14D038E5FBCA36F2FFAEE998" xlink:type="arc" />
    <link:label id="lab_lii_DebtinstrumentCovenantfordebtnotpaid_BB7AE7FA2CB8CF85201836F2FFAE0C6B_terseLabel_en-US" xlink:label="lab_lii_DebtinstrumentCovenantfordebtnotpaid_BB7AE7FA2CB8CF85201836F2FFAE0C6B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">debt instrument, Covenant for debt not paid</link:label>
    <link:label id="lab_lii_DebtinstrumentCovenantfordebtnotpaid_BB7AE7FA2CB8CF85201836F2FFAE0C6B_label_en-US" xlink:label="lab_lii_DebtinstrumentCovenantfordebtnotpaid_BB7AE7FA2CB8CF85201836F2FFAE0C6B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">debt instrument, Covenant for debt not paid</link:label>
    <link:label id="lab_lii_DebtinstrumentCovenantfordebtnotpaid_BB7AE7FA2CB8CF85201836F2FFAE0C6B_documentation_en-US" xlink:label="lab_lii_DebtinstrumentCovenantfordebtnotpaid_BB7AE7FA2CB8CF85201836F2FFAE0C6B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">debt instrument, Covenant for debt not paid</link:label>
    <link:loc xlink:href="lii-20190331.xsd#lii_DebtinstrumentCovenantfordebtnotpaid" xlink:label="loc_lii_DebtinstrumentCovenantfordebtnotpaid_BB7AE7FA2CB8CF85201836F2FFAE0C6B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_lii_DebtinstrumentCovenantfordebtnotpaid_BB7AE7FA2CB8CF85201836F2FFAE0C6B" xlink:to="lab_lii_DebtinstrumentCovenantfordebtnotpaid_BB7AE7FA2CB8CF85201836F2FFAE0C6B" xlink:type="arc" />
    <link:label id="lab_us-gaap_FinanceLeaseInterestPaymentOnLiability_A96C958341718DDDD7C436F2FFAFE97B_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseInterestPaymentOnLiability_A96C958341718DDDD7C436F2FFAFE97B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating cash flows from finance leases</link:label>
    <link:label id="lab_us-gaap_FinanceLeaseInterestPaymentOnLiability_A96C958341718DDDD7C436F2FFAFE97B_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseInterestPaymentOnLiability_A96C958341718DDDD7C436F2FFAFE97B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finance Lease, Interest Payment on Liability</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FinanceLeaseInterestPaymentOnLiability" xlink:label="loc_us-gaap_FinanceLeaseInterestPaymentOnLiability_A96C958341718DDDD7C436F2FFAFE97B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseInterestPaymentOnLiability_A96C958341718DDDD7C436F2FFAFE97B" xlink:to="lab_us-gaap_FinanceLeaseInterestPaymentOnLiability_A96C958341718DDDD7C436F2FFAFE97B" xlink:type="arc" />
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    <link:label id="lab_lii_AverageFloatingCommercialPaperRate_3A1CF39781FC6A8FE6772D5B8C7FCE67_verboseLabel_en-US" xlink:label="lab_lii_AverageFloatingCommercialPaperRate_3A1CF39781FC6A8FE6772D5B8C7FCE67" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Average floating commercial paper rate (as a percent)</link:label>
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    <link:label id="lab_lii_AustraliaNewZealandandAsiaBusinessesMember_E627568E0BA563E869A72D5B8B356394_terseLabel_en-US" xlink:label="lab_lii_AustraliaNewZealandandAsiaBusinessesMember_E627568E0BA563E869A72D5B8B356394" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Australia, New Zealand and Asia Businesses [Member]</link:label>
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    <link:label id="lab_lii_KysorWarrenBusinessMemberDomain_3EB09A91D452EE8396612D5B8B3546F3_verboseLabel_en-US" xlink:label="lab_lii_KysorWarrenBusinessMemberDomain_3EB09A91D452EE8396612D5B8B3546F3" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Australia, New Zealand and Asia Businesses</link:label>
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    <link:label id="lab_lii_MilperraPropertyMember_68286CD39A1906D09CE02D5B8B3670BA_terseLabel_en-US" xlink:label="lab_lii_MilperraPropertyMember_68286CD39A1906D09CE02D5B8B3670BA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Milperra Property</link:label>
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