z, y, x, 
x^2*y*z+x*y^2*z+x*y*z^2+x*y*z+x*y+x*z+y*z
x^2*y^2*z+x*y^2*z^2+x^2*y*z+x*y*z+y*z+x+z
x^2*y^2*z^2+x^2*y^2*z+x*y^2*z+x*y*z+x*z+z+1
