[2 0 0] [2 0 0] [1 0 0] [1 0 0] [1 0 0]
A=[1 0 -3]= [0 1 0] [0 0 1] [0 1 0] [0 1 0]
[0 1 0] [0 0 1] [0 1 0] [1 0 1] [0 0 -3]