efedr[10], refem[10],
efem[9], ferm[9], fere[8], free[8], derm[6], erem[5],
fee[7], ref[7], dem[5], mee[4], der[4], red[4], mer[4], rem[4],
ef[6], fe[6], de[3], em[3], me[3], ee[2], er[2], re[2],
