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:- module(passive_check2,[passive_check2/0]).
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:- use_module(library(chr)).
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:- chr_constraint a/1, b/2.
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:- chr_option(debug,off).
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:- chr_option(optimize,full).
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a(X) # ID, b(X,R) <=> R = 1 pragma passive(ID).
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passive_check2 :-
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a(X), b(X,R), R == 1.
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