büro[12], büsi[11], obis[7], bors[7], birr[6], bris[6], sirr[4],
bio[6], obi[6], bor[6], brr[5], bis[5], roi[4], irr[3], sir[3],
üb[9], ob[5], bi[4], os[3], so[3], si[2],
