[-1,0,0,0]
[1,-1,0,0]
[0,1,-1,0]
[0,0,1,-1]
[-1,0,-1,1]
[-1,-1,1,0]
[-2,1,0,0]
[1,-1,-1,1]
[1,-2,1,0]
[0,1,-2,1]
[0,-1,2,-1]
[-1,2,-1,0]
[-1,1,1,-1]
[2,-1,0,0]
[1,1,-1,0]
[1,0,1,-1]
[0,0,-1,1]
[0,-1,1,0]
[-1,1,0,0]
[1,0,0,0]