obco[7], biot[7], bito[7], boot[7], oboi[6], ciot[6], cito[6], tico[6],
cob[6], bit[6], bot[6], boi[5], obi[5], toi[4], oto[4],
bi[4], bo[4], ci[3], co[3], ot[3], to[3],
