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countdown(0) :- write(0), halt.
countdown(N) :-
write(N), nl,
M is N - 1,
countdown(M).

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• # 2:   hide show   clone   input   110 days 0 hours ago    Success

  result: Success     time: 0.02s    memory: 68352 kB     returned value: 0

  input:

  countdown(0).

  output:

  GNU Prolog 1.3.1
  By Daniel Diaz
  Copyright (C) 1999-2009 Daniel Diaz
  0
• # 1:   hide show   clone   input   110 days 4 hours ago    Success

  result: Success     time: 0.01s    memory: 68352 kB     returned value: 0

  input:

  countdown(20).

  output:

  GNU Prolog 1.3.1
  By Daniel Diaz
  Copyright (C) 1999-2009 Daniel Diaz
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