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Pack purity -- prolog/pset.pl
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Undocumented predicates

The following predicates are exported, but not or incorrectly documented.

 pset_empty(Arg1, Arg2)
 list_set(Arg1, Arg2, Arg3)
 set_list(Arg1, Arg2)
 subset(Arg1, Arg2, Arg3)
 punion(Arg1, Arg2, Arg3)
 pdifference(Arg1, Arg2, Arg3)
 pintersection(Arg1, Arg2, Arg3)