0 0 0 a 0 0 1/2 b 1/3 2/3 0 c 2/3 1/3 0 c 1/3 2/3 1/2 d 2/3 1/3 1/2 d 0 0 z e 0 0 -z e 1/2 0 0 f 0 1/2 0 f 1/2 1/2 0 f 1/2 0 1/2 g 0 1/2 1/2 g 1/2 1/2 1/2 g 1/3 2/3 z h 1/3 2/3 -z h 2/3 1/3 -z h 2/3 1/3 z h x -x 0 i x 2*x 0 i -2*x -x 0 i -x x 0 i -x -2*x 0 i 2*x x 0 i x -x 1/2 j x 2*x 1/2 j -2*x -x 1/2 j -x x 1/2 j -x -2*x 1/2 j 2*x x 1/2 j x 0 z k 0 x z k -x -x z k 0 -x -z k -x 0 -z k x x -z k x y z l -y x-y z l -x+y -x z l -y -x -z l -x+y y -z l x x-y -z l -x -y -z l y -x+y -z l x-y x -z l y x z l x-y -y z l -x -x+y z l