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<!-- XBRL document created with Toppan Merrill Bridge 9.6.8167.22744 --> |
<!-- Based on XBRL 2.1 --> |
<!-- Created on: 8/10/2022 11:34:28 PM --> |
<!-- Modified on: 8/10/2022 11:34:28 PM --> |
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| <roleRef xlink:type="simple" xlink:href="bctciv-20220630.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="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Assets" xlink:label="us-gaap_Assets"/> |
| | <loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueAmount" xlink:label="us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueAmount_637957712680045399"/> |
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| | <loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity"/> |
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| | <loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockShareSubscribedButUnissuedSubscriptionsReceivable" xlink:label="us-gaap_CommonStockShareSubscribedButUnissuedSubscriptionsReceivable_637957712680055397"/> |
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