fere[8], free[8], sfer[8], dres[5], pers[5], eser[4],
pfe[8], fee[7], ref[7], fes[7], der[4], red[4], per[4], rep[4], des[4], sep[4], ser[3],
ef[6], fe[6], de[3], pe[3], ee[2], er[2], re[2], es[2], se[2],
