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Magic square
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:- use_module(library(clpfd)).
main(Dim) :-
magic_square(Square,Dim),
maplist(portray_clause,Square),
Square=[Row|_],
lists:sum_list(Row,Sum),
write(Sum).
magic_square(Square,Dim) :-
magic_square_constraints(Square, Dim),
maplist(label, Square).
magic_square_constraints(Square, Dim) :-
...
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