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<!-- DFIN ActiveDisclosure(SM) XBRL Schema Document - http://www.dfinsolutions.com/ -->
<!-- Creation Date      : 2021-05-10T18:39:00.3925095+00:00 -->
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<!-- Copyright (c) 2021 Donnelley Financial Solutions, Inc. All Rights Reserved. -->
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  <xsd:element id="lrmr_RemainingRestrictedCommonUnitsMember" name="RemainingRestrictedCommonUnitsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="lrmr_VestsOverFortyEightMonthsMember" name="VestsOverFortyEightMonthsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="lrmr_SeriesAPreferredUnitPurchaseAgreementMember" name="SeriesAPreferredUnitPurchaseAgreementMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="lrmr_SeriesBBridgeUnitPurchaseAgreementMember" name="SeriesBBridgeUnitPurchaseAgreementMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="lrmr_SecondSeriesBBridgeUnitPurchaseAgreementMember" name="SecondSeriesBBridgeUnitPurchaseAgreementMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="lrmr_SeriesAAndSeriesBMember" name="SeriesAAndSeriesBMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
</xsd:schema>
