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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.
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To the description should be added: "Include only words 4 or more characters long that appear at least 2 times in the string"
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Pssst. Try little bit of Python
Don't write code like C code, almost every non-C language has lots of built-in functions for everyone to use ;-)
Definitely a fun language :)