thresh P-value %words %seq Nwords Nseq total_words total_seq 7.7731 1.0e-05 10.8% 8.9% 4 4 37 45 6.9692 5.0e-05 16.2% 13.3% 6 6 37 45 6.556 0.0001 24.3% 20.0% 9 9 37 45 5.461 0.0005 40.5% 33.3% 15 15 37 45 4.9154 0.001 54.1% 44.4% 20 20 37 45