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  1. odd(N) :- 1 is mod(N, 2).
  2. even(N) :- 0 is mod(N,2).
Success #stdin #stdout 0.02s 68352KB
stdin
odd(12)

even(9)
stdout
GNU Prolog 1.3.1
By Daniel Diaz
Copyright (C) 1999-2009 Daniel Diaz
uncaught exception: error(syntax_error('user_input:3 (char:1) . or operator expected after expression'),read_term/3)