Use the {v: value, f: 'formatted value'} object to create unique nodes with 
the same display names: 

["Population",null,0,0],
["Region_A","Population",0,0],
["Region_B","Population",0,0],
["Region_C","Population",0,0],
[{v: 'Adult_A', f: "Adult"},"Region_A",1,0],
[{v: 'Minor_A', f: "Minor"},"Region_A",1,0],
[{v: 'Adult_B', f: "Adult"},"Region_B",1,0],
[{v: 'Minor_B', f: "Minor"},"Region_B",1,0],
[{v: 'Adult_C', f: "Adult"},"Region_C",1,0],
[{v: 'Minor_C', f: "Minor"},"Region_C",1,0]

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