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  1. minus(x,y,x-y).
  2. :-minus(2,1,1).
Success #stdin #stdout #stderr 0.02s 6204KB
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Standard input is empty
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Standard output is empty
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Warning: /home/qrRUnV/prog.pl:2:
	Goal (directive) failed: user:minus(2, 1, 1)
https://ideone.com/tNU4Lm
language:
Prolog (swi 7.6.4)
created:
13 years ago
visibility:
public

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