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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.
The line is printed many times because there is many tests and your solution is called more than once.
Your solution is not exactly correct. It incorrectly recognizes some non-square numbers as squares, for example 114 or 155.