fere[8], free[8], sfer[8], eser[4], eses[4], sers[4],
fee[7], ref[7], fes[7], ehe[5], her[5], hes[5], ser[3],
ef[6], fe[6], eh[4], he[4], ee[2], er[2], re[2], es[2], se[2],
