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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.
when using list comprehensions, if you have no else to add, you should use the if after the for not before it. I guess that's the reason
try it yourself.
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done
not really. I think solving simple problems with method won't improve your problem solving skills.