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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.
They're not really the same. emirps is a lot stricter performance wise.
Look at the bottom of the two pages. Mine was done "April 24 2015, the other "August 27 2015" so post this remark at https://www.codewars.com/kata/emirps.