* 6-dim hypercube
H-representation
begin
    12    7    integer
 1  1  0  0  0  0  0
 1  0  1  0  0  0  0
 1  0  0  1  0  0  0
 1  0  0  0  1  0  0
 1  0  0  0  0  1  0
 1  0  0  0  0  0  1
 1 -1  0  0  0  0  0
 1  0 -1  0  0  0  0
 1  0  0 -1  0  0  0
 1  0  0  0 -1  0  0
 1  0  0  0  0 -1  0
 1  0  0  0  0  0 -1
end