0 0 z a
0 0 z+1/2 a
1/2 1/2 z b
1/2 1/2 z+1/2 b
0 1/2 z c
1/2 0 z+1/2 c
x 0 z d
-x 0 z d
0 x z+1/2 d
0 -x z+1/2 d
x 1/2 z e
-x 1/2 z e
1/2 x z+1/2 e
1/2 -x z+1/2 e
x y z f
-x -y z f
-y x z+1/2 f
y -x z+1/2 f
x -y z f
-x y z f
-y -x z+1/2 f
y x z+1/2 f