abba[8], baba[8], abbe[8], bebe[8], ebbe[8], abee[6], beie[6], eibe[6],
cab[8], beb[7], ebb[7], aba[5], abi[5], bai[5], bei[5], eia[3],
ab[4], bi[4], aa[2], ai[2], ei[2],
