r= x^8 - x^4 + 1 q= (x^12 - 2*x^11 + 3*x^10 - 4*x^9 + x^8 + 2*x^7 - 3*x^6 + 4*x^5 - x^4 - 2*x^3 + 3*x^2 + 4*x + 2)/8 P= 8*q_k24method67 v= x