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<?xml version="1.0" encoding="windows-1252"?> |
<!-- XBRL document created with Toppan Merrill Bridge 9.4.0.81 --> |
<!-- Based on XBRL 2.1 --> |
<!-- Created on: 11/1/2019 7:49:20 PM --> |
<!-- Modified on: 11/1/2019 7:49:20 PM --> |
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| <roleRef xlink:type="simple" xlink:href="bctciv-20190930.xsd#StatementCondensedBalanceSheets" roleURI="http://www.bostoncapital.com/role/StatementCondensedBalanceSheets"/> |
| <calculationLink xlink:role="http://www.bostoncapital.com/role/StatementCondensedBalanceSheets" xlink:type="extended" xlink:title="00100 - Statement - Condensed Balance Sheets"> |
| | <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets"/> |
| | <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CostMethodInvestments" xlink:label="us-gaap_CostMethodInvestments_637082345604768008"/> |
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| | <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity"/> |
| | <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Liabilities" xlink:label="us-gaap_Liabilities_637082345604768008"/> |
| | <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity" xlink:to="us-gaap_Liabilities_637082345604768008" order="1" use="optional" weight="1"/> |
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| | <calculationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity" xlink:to="us-gaap_StockholdersEquity_637082345604768008" order="2" use="optional" weight="1"/> |
| | <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockValue" xlink:label="us-gaap_CommonStockValue_637082345604768008"/> |
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| | <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockShareSubscribedButUnissuedSubscriptionsReceivable" xlink:label="us-gaap_CommonStockShareSubscribedButUnissuedSubscriptionsReceivable_637082345604768008"/> |
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