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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.
Thanks for the comments on this one. The comment about the old man made me laugh - it was the car that was old :D
took me a few days to slove this kata, thank you so much for explainations, really helped me understand how to write better code in the future.