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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.
I think the problem are algos which need randomness. Python's radnom is so slow on CW
That's because Python itself is tad slower than JS. I had to reduce the amount of big tests from 30 to 5, and still only the simpliest solutions pass.