removeZeroTrailingTerms CRemove trailing zero terms in a complex
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If C has only one nonzero term, then the functions returns two zero maps.
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The object removeZeroTrailingTerms is a method function.
The source of this document is in /__w/M2/M2/macaulay2-1.26.05+ds/M2/Macaulay2/packages/ChainComplexExtras.m2:1463:0.