pfe[8], fen[7], nef[7], ref[7], cep[5], cen[4], cne[4], men[4], nem[4], nep[4], pen[4], cer[4], mer[4], rem[4], per[4], rep[4], ner[3], ren[3],
ef[6], fe[6], ce[3], em[3], me[3], pe[3], en[2], er[2], re[2],
