bibo[8], bido[7], biot[7], bito[7], pito[6], topi[6],
bib[7], bob[7], bid[6], bod[6], bit[6], bot[6], boi[5], obi[5], dip[5], pod[5], dit[5], pit[5], pot[5], top[5], doi[4], ido[4], poi[4], toi[4],
bi[4], bo[4], id[3], do[3], od[3], pi[3], op[3], po[3], ot[3], to[3],
