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I'm not convinced that #6 is sufficiently analogous to the others. There's no dodecagon, for one thing. —Tamfang (talk) 00:06, 6 June 2012 (UTC)[reply]
Yes, agreed, a limit of regular polygons, but would have a coplanar coinciding dodecagon base. Tom Ruen (talk) 04:44, 6 June 2012 (UTC)[reply]