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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 bit of an ordeal trying to figure out what a "subsequence" is. It's not explained in the description or the wikipedia entry, as far as I can see. I'd recommend explicitly stating that each character of the LCS should be found after the previous character within each string.
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