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Logtalk - Object oriented extension to Prolog
Release 2.16.0

Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
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% towers of hanoi using three disks:

| ?- hanoi::run(3).

Move a disk from left to right.
Move a disk from left to middle.
Move a disk from right to middle.
Move a disk from left to right.
Move a disk from middle to left.
Move a disk from middle to right.
Move a disk from left to right.

yes


% placing eight queens in a chess table:

| ?- queens::queens(8).

[1-5,2-7,3-2,4-6,5-3,6-1,7-4,8-8]

yes
