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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 had similar problem. Make sure you are not using global variables. When performing tests, they are not refreshed.
I had identical code that worked on my machine, but didn't work in here
Test seems incorrect according to task (Java):
Input: 'doggy5sat' expected:<d[3y5sa]t>
I assume d3y5sat is expected, without brackets