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  1. program :-
  2. write('Hello, World!'), nl.
  3. :- program.
Success #stdin #stdout 0.02s 68352KB
stdin
1
2
10
9
0
10
42
stdout
GNU Prolog 1.3.1
By Daniel Diaz
Copyright (C) 1999-2009 Daniel Diaz
uncaught exception: error(syntax_error('user_input:2 (char:1) . or operator expected after expression'),read_term/3)