pfe[8], fen[7], nef[7], ref[7], ben[5], cep[5], ber[5], erb[5], reb[5], cen[4], cne[4], nep[4], pen[4], cer[4], per[4], rep[4], ner[3], ren[3],
ef[6], fe[6], be[4], ce[3], pe[3], en[2], er[2], re[2],
