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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.
Oh, that's what spoilers do? I already forgot.
Answering with a spoilered reply won't be much help to people who haven't solved the kata.
Hello. You should be familiar with graphs, mostly, and methods of search in the graph.