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gcfac is a factoring function that attempts to apply the same heuristics which
scientists apply in trying to make expressions simpler.  gcfac is limited
to monomial-type factoring.  For a sum, gcfac does the following:
Item (3) does not necessarily do an optimal job of pairwise factoring because of the combinatorially-difficult nature of finding which of all possible rearrangements of the pairs yields the most compact pair-factored result.
load ("scifac") loads this function.
demo ("scifac") shows a demonstration of this function.
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