abba[8], baba[8], abbe[8], bebe[8], ebbe[8], abee[6], bane[6], nabe[6], bene[6], eben[6], ebne[6],
beb[7], ebb[7], aba[5], ban[5], nee[3],
ab[4], aa[2], an[2], na[2], ne[2],