buren[7], urner[5],
bure[6], reun[4], rune[4], uren[4], urne[4],
erb[5], brr[5], ern[3], ren[3], neu[3], reu[3], ure[3], nur[3], run[3],
ne[2], er[2], re[2], nu[2], ur[2],
