birr[6], bris[6], sirr[4], idus[4], surr[4],
brr[5], bis[5], bus[5], dir[3], irr[3], dis[3], sir[3], dur[3], sud[3], uds[3], rus[3], sur[3], urs[3],
bi[4], si[2], du[2], ud[2], ui[2], ur[2],
