birg[7], burg[7], grub[7], birr[6], murr[6], girr[5], urig[5], gurr[5],
bim[7], bum[7], gib[6], bug[6], mir[5], brr[5], mur[5], rum[5], gur[4], irr[3],
bi[4], im[4], mi[4], um[4], ui[2], ur[2],
