containsFlag(fl, P)
containsFlag(fl, M)
containsFlag(fl, S)
containsFlag(fl, V)
Given a list of facet labels fl and a polytope, a matroid, a (symbolic) slack matrix or a list of vertex coordinates, matroid vectors, facet labels, establishes whether or not fl contains a flag in the given object.
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The object containsFlag is a method function with options.