epok[6], kopn[6], open[5], peon[5], poen[5], neon[4],
kop[5], eko[4], nok[4], nep[4], pen[4], eon[3], one[3], non[3],
ko[3], ok[3], pe[3], op[3], po[3], en[2], eo[2], no[2], on[2],
