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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.
What is result + [0] doing?
It's taking the stuff inside the ()'s in join() and stringing the elements in the list together with spaces.
An example is given in the problem description
how woudl I call this
My solution is not passing all test cases. For example, I get '' should equal '123'
What does that even mean? This is not explained at all in the description. If it told me what the expected output should be for all inputs I would add that to my function, but it's not written anywhere.
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This comment is hidden because it contains spoiler information about the solution
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