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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.
More a pattern recognition problem than anything else.
Kind of fun as a puzzle but if you're practicing for acquiring algorithmic skills I would not recommend it at all.
I would say to pay attention to the patterns and pay attention to inversions and reposition of odds and evens