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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.
str.stripremoves any of the characters in the parameter, not necessarily in the given order.Also, try make your solution work first before you try and golf it :P
Not an issue when your code doesn't work