skip degree-6 polynomials with too large degree-2 coefficient
skip degree-6 polynomials with too large degree-2 coefficient

mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs