r= x^48 + x^46 - x^38 - x^36 - x^34 - x^32 + x^28 + x^26 + x^24 + x^22 + x^20 - x^16 - x^14 - x^12 - x^10 + x^2 + 1 q= ( x^74 + 2*x^72 + x^70 + x^4 - 2*x^2 + 1 ) / 4 P= x^37 + 2*x^36 + x^35 + x^2 - 2*x + 1 v= x^2