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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.
Actually, I should post it as an issue.
PHP version is much less performance demanding than the Python version. It took over 10s for my code to deal with it in Python, while the same algorithm in PHP did it in less than 2s.
In PHP max number in array is 1300, in Python 1000000. It's a glaring disproportion, please fix it.