#g2 f1 % point group to the space group of g.2.3
4	% generator
 -1 -1 0 0
  0  1 0 0
  0  0 1 0
  0  0 0 1
4	% generator
  0  0 -1  0
  0  0  0 -1
  1  0  0  0
 -2 -1  0  0
4x0	% invariant form
 2
 1 1
 0 0 2
 0 0 1 1
% order of the group unknown
