     #nodes  #regions   #procs   #which case
      19        3        3       MultipleRegionsPerProc
     nodeID   regionID   procID
       0         0        0
       1         0        0
       2         0        0
       3         0        0
       4         0        0
       5         0        0
       6         0        0
       6         1        1
       7         1        1
       8         1        1
       9         1        1
      10         1        1
      11         1        1
      12         1        1
      12         2        2
      13         2        2
      14         2        2
      15         2        2
      16         2        2
      17         2        2
      18         2        2
