#	i	iter	j	itact	n
6 7
   1   -1    0    0    0    1   -2 
   1    1    0   -1    0    0   -3 
   1    0   -1    0    1    0    0 
   1    0    1    0    0    0   -1 
   1    0    0    1    0    0   -4 
   1    0    0    0    0    0    1 

1 4
   1    0    0    1 
