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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.
Make sure that there is a whitespace. It's "' '{3}" not "{3}". :)
doesnt work for me :/
It's stated in the problem that RNA cannot have 'T' and DNA cannot have 'U', so how could both of them be in the same sequence for either type?