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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.
One simple peice of code I recentely had to write was to convert from decimal degrees to degrees minuetes seconds, I'm actually more into GIS than programming. It's really quite easy, but I thought it would make a nice little Kata. Here's a link for the math.
http://www.rapidtables.com/convert/number/degrees-to-degrees-minutes-seconds.htm