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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.
Some test are not working, for example, I got: Not the correct number of Fridays between 2014 and 2015 - Expected: 3, instead got: 4.
But actually there are 4 and not 3:
2014-01-31T00:00:00.000Z
2014-02-28T00:00:00.000Z
2014-10-31T00:00:00.000Z
2015-07-31T00:00:00.000Z