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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.
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If you have more suitable pairs than one, you should look at the second element of each pair. The pair that has the second element with the smallest index is solution.
For example: ([1, 2, 5, 4], 6) -> [1,5], ([2,4,6,8],10) -> [4,6].