4 4 4 5 u*m + u*h - h*m - h
u*m^4 + u*h^4 - h*m^4 - h^5
-h^5 + u*h^4 + u*m^4 - h*m^4
5 4 4 - h + u*h + m *(u - h)
5 / 4 4\ 4 - h + u*\h + m / - h*m
-h^5 + u*(h^4 + m^4) - h*m^4
/ 4 4\ (u - h)*\h + m /
(u - h)*(h^4 + m^4)