r= x^36 - x^34 + x^32 - x^30 + x^28 - x^26 + x^24 - x^22 + x^20 - x^18 + x^16 - x^14 + x^12 - x^10 + x^8 - x^6 + x^4 - x^2 + 1 q= x^42 - 2*x^40 + x^38 + x^4 + 2*x^2 + 1 P= x^21 - 2*x^20 + x^19 + x^2 + 2*x + 1 v= x^2