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|  | Pack assertions -- prolog/ppntprops.pl | 
Assertions status that can be used at literal level, for instance:
p(A, B) :-
    q(A, B),
    check((int(A),int(B))).
this differs from simply call check/1 in which it will add location information fo facilitate debuging.
The following predicates are exported, but not or incorrectly documented.