Generators of Roos' example 2611: -x -y -z -u -v;
Weights:                           1  1  1  1  1;
<Limiting weight: 7;>
Relations:
[y,u];
[x,v];
[y,y]-[u,u];
[y,z]-[y,v]-[z,v];
[z,u]-[x,u]-[x,z];
[x,x]-2 [x,y]-2 [z,v];
[v,v]-2 [u,v]-2 [x,z].