NumNodes:   8
NumGroups:  9
NumLevels:  2
LevelSizes: 8 1
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G[0][1]{1}
G[0][1]{2}
G[0][1]{3}
G[0][1]{4}
G[0][1]{5}
G[0][1]{6}
G[0][1]{7}
G[1][8]{0,1,2,3,4,5,6,7}