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