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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 experienced the same issue as Artiluck and many others: the tests are flawed on their own. I'm new to codewars, and assumed that:
"N ffns bt,\nYur wrtng s mng th wrst 'v vr rad"
was my answer, and for some reason my code had decided not to remove the 'u' of 'your' and the 'a' of 'read', when it was actually the preset expected result. The tests are flawed.