febr[10], fibr[10], efir[8], biec[7], brei[6], brie[6],
cif[8], ref[7], ber[5], erb[5], reb[5], cie[4], cer[4], rei[3],
ef[6], fe[6], fi[6], be[4], bi[4], ce[3], ci[3], er[2], re[2],
