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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.
The test with [300,400] with a gap of 10, there is a pair before 337, and it's 307 and 317
The test with [100,110] with a gap of six, the reuslt isn't null, beacause there is the pair [101,107]