grund[6],
burg[7], grub[7], bund[6], dung[5], lund[5], guru[5], rund[4], urdu[4],
bug[6], lug[5], lud[4], gnu[4], gur[4], dun[3], und[3], dur[3], nur[3], run[3],
ul[3], du[2], ud[2], nu[2], ur[2],