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["Group","ParentGroup"]
["Parent-1",""]
["Child-1a","Parent-1"]
["Child-1b","Parent-1"]
["Child-1c","Parent-1"]
["Grandchild-1b.1","Child-1a"]
["Grandchild-1b.2","Child-1a"]
["Greatgrandchild-1b.1.1","Grandchild-1b.2"]
["Greatgreatgrandchild-1b.1.1.1","Greatgrandchild-1b.1.1"]
["Parent-2",""]
["Child-2a","Parent-2"]
["Child-2b","Parent-2"]
["Parent-3",""]
["Parent-4",""]
["Child-4a","Parent-4"]