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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.
Ok, thanks for explanation. I started to code only few weeks ago. :)
Can you really multiply str by float? If I try this code, error occurs.