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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.
Why y is considered as vowel ???
What do you need clarification about? First you sort the array in descending order, then you sum up the differences.
instructions it not clear about sorting stuff need more clarify explanation and some additional example