refem[10],
efem[9], ferm[9], fere[8], free[8], merg[7], erem[5],
fee[7], ref[7], frr[7], gem[6], erg[5], mee[4], mer[4], rem[4],
ef[6], fe[6], em[3], me[3], ee[2], er[2], re[2],
