biec[7], obce[7], echo[7], heco[7], choi[7], obie[6],
che[6], ech[6], hec[6], chi[6], ich[6], cob[6], hoc[6], och[6], boi[5], obi[5], hoi[5], cie[4],
be[4], eh[4], he[4], bi[4], hi[4], bo[4], ho[4], oh[4], ce[3], ci[3], co[3], eo[2],