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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.
Very questionable use of the phrase "entire pair is earlier". Entire pair is NOT earlier in your example. In the first pair, the first element is earlier, in the second - second is earlier. It seems that the description is matched to the algorithm.