NumNodes:   4
NumGroups:  7
NumLevels:  3
LevelSizes: 4 2 1
G[0][1]{0}
G[0][1]{1}
G[0][1]{2}
G[0][1]{3}
G[1][2]{0,1}
G[1][2]{2,3}
G[2][4]{0,1,2,3}