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 y z b
-x+1/2 -y z+1/2 b
-x y+1/2 -z+1/2 b
x+1/2 -y+1/2 -z b
z x y b
z+1/2 -x+1/2 -y b
-z+1/2 -x y+1/2 b
-z x+1/2 -y+1/2 b
y z x b
-y z+1/2 -x+1/2 b
y+1/2 -z+1/2 -x b
-y+1/2 -z x+1/2 b