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Jun 23, 2017 at 6:34 comment added Alexey Ustinov You also can take a rubber loop passing through rings in points $APBPCPA$.
S Jun 23, 2017 at 6:13 history answered user35593 CC BY-SA 3.0
S Jun 23, 2017 at 6:13 history made wiki Post Made Community Wiki by user35593