# T2
4 5
-1 0 0 1 2
0 0 1 0 0
0 0 0 1 0
0 0 0 0 1


# T1
4 5
0 0 1 0 0
0 1 0 0 0
0 0 0 1 0
0 0 0 0 1


# D1
6 6
#  i  j  k  N  c
1  1  0  0  0 -2
1 -1  0  0  1  0
1  0  1  0  0 -1
1 -1 -1  0  1  1
1  0 -1  1  0 -1
1 -1  0 -1  1  1

# D2 (=D1)
6 6
#  i  j  k  N  c
1  1  0  0  0 -2
1 -1  0  0  1  0
1  0  1  0  0 -1
1 -1 -1  0  1  1
1  0 -1  1  0 -1
1 -1  0 -1  1  1



0 3

N
skew
