fere[8], free[8], krep[6], erek[5], nerp[5],
pfe[8], fee[7], fen[7], nef[7], ref[7], nep[4], pen[4], ker[4], rek[4], per[4], rep[4], ner[3], ren[3],
ef[6], fe[6], pe[3], ee[2], en[2], er[2], re[2],
