id, x, y ,layer
 A, 0,  0,  1
 B, 1, .7,  1
 C, 2,  1,  1
 D, 2,  0,  2
 E,.2,1.5,  1
 F,.1, .5,  2
 G, 2,  1,  2
 H, 1,  1,  2