beko[7], epok[6], kopn[6], open[5], peon[5], poen[5],
bek[6], bok[6], ben[5], bon[5], kop[5], eko[4], nok[4], nep[4], pen[4], eon[3], one[3],
be[4], bo[4], ko[3], ok[3], pe[3], op[3], po[3], en[2], eo[2], no[2], on[2],
