abba[8], baba[8], babi[8], biba[8], abbo[8], babo[8], boba[8], obab[8], bibo[8],
bab[7], bib[7], bob[7], bai[5], abo[5], boa[5], oba[5], boi[5], obi[5],
ba[4], bi[4], bo[4], aa[2], ii[2],
