AB = [ 1, 1, 2, 1 ]
BC = [ 2, 1, 2, 3 ]
CD = [ 2, 3, 5, 3 ]
DE = [ 5, 3, 5, 5 ]
EF = [ 5, 5, 1, 5 ]
FA = [ 1, 5, 1, 1 ]