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Double curvature?
editNeeds description of what double curvature is (it was extremely difficult to find a clear definition, and when I did, it contradicted what the images on this page show)--if it can't be adequately explained, it needs to be removed.
Reiteration
editReiteration with Diagrid. — Регион102 (talk) 16:23, 11 June 2013 (UTC)