4
1 . . .
. . . 3
3 . . .
. . . 1
% Quasigroup completion problem. 
% This problem file is used by 
% http://www.hakank.org/comet/quasigroup_completion.co
% 
% Example from Global Constraint Catalogue
% http://www.emn.fr/x-info/sdemasse/gccat/sec2.7.108.html
% 12 solutions.