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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.
"called more than once with the same argument" is not a very descriptive test comment
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The decription is very unclear, specifically in regards to how to handle functions and objects. The description states in regards to functions:
'Each time the original function is called, the context and arguments should be preserved.'
There is no notion of their being arguments anywhere else in the description. What arguments? This is very unclear.