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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.
@chadluo, it's great, that you showed where have you taken your factor function.
I have the same situation. My solution did't pass time conditions.
Once more time thanks for honesty!
Elegant.
shorter than mine!