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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.
All the coins have to meet on the same vertex, not just two of them. u1 and u2 can stay together since they start on the same vertex but they need to meet up with u3.