GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it

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<Verb>BoundaryPair(K):: RegCWComplex --> RegCWMap</Verb><P/>
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<P/> Inputs a pure regular CW-complex <M>K</M> and returns the  
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regular CW-inclusion 
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map  <M>\iota \colon  \partial K \hookrightarrow
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K</M> from the boundary  
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<M>\partial K</M> into the complex <M>K</M>.
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