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