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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.
Given a list of unique numbers sorted in ascending order,- Unless the description was different at the time of your comment, they did specify it was ascending/unique. Solution works and I did the same. Yes it doesn't work for disordered arrays, but that wasn't the task to complete.