# A 4x4 asymmetric matrix
#  1  0  0  0
# -1  2  0  3
#  0  1  6 -1
#  0  0  1  1
4 4 10
0 0  1
0 2  0
1 0 -1
1 1  2
1 3  3
2 1  1
2 2  6
2 3 -1
3 2  1
3 3  1 
