fen[7], nef[7], ref[7], bek[6], kem[5], ben[5], ber[5], erb[5], reb[5], men[4], nem[4], ker[4], rek[4], mer[4], rem[4], ner[3], ren[3],
ef[6], fe[6], be[4], em[3], me[3], en[2], er[2], re[2],
