X Y Ax1 Cx1 Bx3 Z Gx18 Fx3 Ex1 2 1 B B X G X6 H X6 G B H B A A G X 6 H X 6 4 3 D Y D G X6 H X6 G D H D C C G X 6 H X 6 6 5 F F H X6 Z G F H G X6 E F E G 7 X 6 H X 6 Dx3 Hx18 Ix1