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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.
wrong function name for post-order traversal
I don't think that's necessary.
What are the solutions if 6 words together appear? Should it be the 6 different ways of choosing 5 of the words, or just the 6 words?
The description is difficult to understand