There is a group of islands connected by bridges so that from each island you can get
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There is a group of islands connected by bridges so that from each island you can get to any other. The tourist went around all the islands, passing through each bridge exactly once. On the island of Threefold, he was three times. How many bridges leads from Threefold, if a tourist a) didn't start from it or finish in it? b) started from it, but didn't finish in it? c) started from it and finished in it?
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