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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 added a clarification to the description.
Because 21:59 is later in the day than 19:25.
lol
The reason you reached stack limit is probably because you didnt handle the case where the digit might have been 0.