brei[6], brie[6], birr[6], bies[6], bers[6], sire[4],
ber[5], erb[5], reb[5], brr[5], bis[5], rei[3], eis[3], sie[3], ser[3], sir[3],
be[4], bi[4], er[2], re[2], es[2], se[2], si[2],
