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Pack xlibrary -- prolog/substitute.pl
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Undocumented predicates

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

 substitute(Arg1, Arg2, Arg3)
 substitute_value(Arg1, Arg2, Arg3, Arg4)
 substitute_values(Arg1, Arg2, Arg3)
 is_subterm(Arg1, Arg2)