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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.
This is actually an issue.
The test cases are formatted without seconds and timezone but the actual submission tests include them. I accounted for this oddity in my solution, but I think this should be fixed to be one way or the other.
I honestly hate my block solution, but I needed to finish up and move on to something else. It's SOO inelegant.
The check function is an interesting alternative to using a Set. Smart, although maybe more resource intensive.
My only nit would be to use the triple equals in your check function.