The Double Cover of an Annulus from  (http://www.math.toronto.edu/~drorbn/classes/0405/Topology/DoubleCover/DoubleCover.html)
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- (del) (cur) 23:12, 12 Sep 2005 . . Drorbn (46517 bytes) (The Double Cover of an Annulus from [http://www.math.toronto.edu/~drorbn/classes/0405/Topology/DoubleCover/DoubleCover.html])
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