D3, nested appends, and data flow

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I found mention of nested selection on another post, which pointed to http://bost.ocks.org/mike/nest/. But is nested selection, and therefore breaking apart the appends into three chunks, appropriate/idiomatic for this situation? Or is there actually a well-constructed way to form this structure in one chain of declarations? It seems like there might be a way with subselections mentioned on https://github.com/mbostock/d3/wiki/Selections, but I'm not familiar enough with the language to test that hypothesis.

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