4
0 1 2 3
2 0 4 1 
1 4 0 2
3 0 1 0
% Quasigroup completion problem. 
% This problem file is used by 
% http://www.hakank.org/comet/quasigroup_completion.co
% 
% Example from Gomes & Shmoys, page 3.
% Solution:
% 4 1 2 3
% 2 3 4 1
% 1 4 3 2
% 3 2 1 4