{ae-bd,af-cd,bf-ce,ah-bg,ai-cg,bi-ch,dh-eg,di-fg,ei-fh}
{
(1,0,2,4,3,5,7,6,8),
(1,2,0,4,5,3,7,8,6),
(3,4,5,0,1,2,6,7,8),
(3,4,5,6,7,8,0,1,2)
}
