M 2 0 220 7 0 220 M 1 0 220 2 0 220 M 0 0 220 1 0 220 M 7 0 220 0 0 220 M 1 -2 3 4 0 -2 3 ST 0 8 4 0 X ST 1 8 4 16 8 0 X ST 2 8 4 16 8 0 X Z1