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chainComplex -- make a chain complex

Description

chainComplex -- a method for creating chain complexes.

Ways to use `chainComplex` :

chainComplex(GradedModule) -- make a chain complex from a graded module
chainComplex(List) -- make a chain complex
chainComplex(Sequence), see chainComplex(List) -- make a chain complex
chainComplex(Matrix) -- make a small chain complex
chainComplex(Ring) -- make an empty chain complex over a ring