36 leftFront = (frontY * 3) + leftX,
37 centreFront = (frontY * 3) + centreX,
38 rightFront = (frontY * 3) + rightX,
39 leftHalf = (halfY * 3) + leftX,
40 centreHalf = (halfY * 3) + centreX,
41 rightHalf = (halfY * 3) + rightX,
42 leftBack = (backY * 3) + leftX,
43 centreBack = (backY * 3) + centreX,
44 rightBack = (backY * 3) + rightX