beki[7], beko[7], boki[7], kobo[7], obok[7], keki[6], obie[6], koki[6], oboi[6], koko[6],
bek[6], bok[6], bee[5], kek[5], boi[5], obi[5], kok[5], kei[4], kie[4], eko[4], kio[4], koi[4], oko[4],
be[4], bi[4], bo[4], ki[3], ko[3], ok[3], ee[2], eo[2],
