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Perestroikas of vertex sets at umbilic points
V2: Latex, 17 pages, 9 figures. Some minor misprints added. Interesting comments from Prof. V.I. Arnold added -
Pre-Symmetry Sets of 3D shapes
ACM-class: I.2; I.5; I.4; J.2. Latex, 3 grouped figures. The final version will appear in the proceedings of the First International Workshop on Deep Structure, Singularities...
