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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.
+=creates a new string every time.This comment is hidden because it contains spoiler information about the solution
where is the dictionary is?
Loops can be slower than comprehensions. Also, you're creating a new string on each iteration, which is bad for performance as well.
Same here ;) but the 'basic' nested loop feels easier to read isn't it ?