pfe[8], fen[7], nef[7], ref[7], hep[6], ben[5], hen[5], ber[5], erb[5], reb[5], her[5], nep[4], pen[4], per[4], rep[4], ner[3], ren[3],
ef[6], fe[6], be[4], eh[4], he[4], pe[3], en[2], er[2], re[2],
