efeb[10], febr[10], fere[8], free[8], bece[7], rebe[6], erce[5],
fee[7], fen[7], nef[7], ref[7], bee[5], ben[5], ber[5], erb[5], reb[5], cen[4], cne[4], cer[4], ner[3], ren[3],
ef[6], fe[6], be[4], ce[3], ee[2], en[2], er[2], re[2],
