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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
A component/subgraph of a disconnected graph is not necessarily of order = 2. This solution would not pass a more complete set of tests.
Yes, because the X in the middle is surrounded by ~ on all sides, which makes it a distinct island.