x^38-x^37-x^35-x^34-x^33+x^32-x^31-x^30-x^29-x^28-x^27+ x^24-x^21+x^19+x^15-x^12+x^11-x^10-x^8+x^7+x^5-x^4+x^3-x^2-x-1