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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.
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In example 2 , we are given a list of numbers called nums. The list contains 2 numbers, which are 0 and 1. We are told that there is a missing number in the range of numbers from 0 to 2. Since there are 2 numbers in the list, the range of numbers should also include 2, but it is missing from the list. Therefore, 2 is the missing number in this case.