r= x^16 + x^14 - x^10 - x^8 - x^6 + x^2 + 1 q= (x^34 + 2*x^32 + x^30 + x^4 - 2*x^2 + 1) / 4 P= x^17 + 2*x^16 + x^15 + x^2 - 2*x + 1 v= x^2