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There are a few hierarchy tags:

(859 questions):

For issues relating to creating, maintaining, or displaying a hierarchy of data or resources, etc.

(559 questions):

For questions relating to hierarchical or nested data.

(148 questions);

For issues relating to arranging data and/or resources in a hierarchy

These all appear to be the same and should be merged and synonymised.

Potentially and could also be included though I'm not convinced of the query especially.

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closed as off-topic by Martijn Pieters, nicael, gnat, Shadow Wizard, Sompuperoo Oct 8 at 23:31

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I agree with your assessment of these tags needing to be merged. Unrelated: I think these tags are all only marginally useful to begin with. –  jadarnel27 Dec 10 '12 at 19:54