Can anyone help me with Prolog ? - Programmers Heaven

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Can anyone help me with Prolog ?

I have a problem in Strawberry Prolog .
i copied this program from a pdf called prolog programming contests .

:- use_module(contestlib, [writeN/2]).
cross(N) :-
hor_line(N),
N1 is N - 1,
B1 is N1 // 2,
Middle is N1 + B1,
down(N,
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