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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.
I should have been abstract not only Row but also Rows. Operating on List in Plane is not best from the OO perspective.
Full 4 hours on this one
It took me full 3 hours of non stop coding to finish this. I only look on wikipedia.
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