x x x a
-x+1/2 -x x+1/2 a
-x x+1/2 -x+1/2 a
x+1/2 -x+1/2 -x a
x 0 1/4 b
-x+1/2 0 3/4 b
1/4 x 0 b
3/4 -x+1/2 0 b
0 1/4 x b
0 3/4 -x+1/2 b
x y z c
-x+1/2 -y z+1/2 c
-x y+1/2 -z+1/2 c
x+1/2 -y+1/2 -z c
z x y c
z+1/2 -x+1/2 -y c
-z+1/2 -x y+1/2 c
-z x+1/2 -y+1/2 c
y z x c
-y z+1/2 -x+1/2 c
y+1/2 -z+1/2 -x c
-y+1/2 -z x+1/2 c