#####
##### Masaaki Harada, Akihiro Munemasa
#####

> W_12_6 := Matrix(12,12,[
> [0, 0, -1, 1, 0, -1, 0, 1, 1, 0, -1, 0],
> [0, 1, -1, 0, 0, 1, 0, 0, -1, 1, -1, 0],
> [1, 1, 1, 0, 1, 0, 0, 1, 0, 0, 0, 1],
> [-1, 1, 0, 0, 0, -1, -1, 0, 0, 1, 1, 0],
> [1, 0, 0, -1, 0, -1, 1, 0, 0, 1, 0, -1],
> [-1, 0, 0, -1, -1, 0, 1, 1, 0, 0, 0, 1],
> [0, 0, 0, 1, 0, 1, 1, 0, 1, 1, 1, 0],
> [0, -1, -1, 0, 1, 0, 0, 1, -1, 0, 1, 0],
> [0, 0, 0, 1, 0, -1, 1, -1, -1, 0, 0, 1],
> [0, 0, -1, -1, 1, 0, 0, -1, 1, 0, 0, 1],
> [-1, -1, 1, 0, 1, 0, 0, 0, 0, 1, -1, 0],
> [1, -1, 0, 0, -1, 0, -1, 0, 0, 1, 0, 1]
> ]):

> writeto("W12.7.txt");