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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.
Converting binary to decimal is a duplicate, regardless of the fact whether you have to do it manually or not.
If you want users to come up with a homebrewn recipe, I would disable all imports and unicode escape sequences.