opnę[9], open[5], peon[5], poen[5],
efę[11], pfe[8], pnę[8], fee[7], fen[7], nef[7], efo[7], fon[7], nep[4], pen[4], eon[3], one[3],
ef[6], fe[6], pe[3], op[3], po[3], ee[2], en[2], eo[2], no[2], on[2],
