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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.
True ... but is your test really valid given it contains two integers that appear odd times. The one premise the exercise is that only one integer will appear odd times in the list.