r=x^32 + x^28 - x^20 - x^16 - x^12 + x^4 + 1 q= (2* (x^8+1)^2 + (1-x^8)^2*(x^25 + x^15 - x^5)^2) / 8 P= 2* (x^4+1)^2 + (1-x^4)^2*(x^10 + x^5 - 1)^2*x^5 v= x^2