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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.
That is evil if what brodie says is considered.
They don't necessarily arrive on the minute intervals. Your calculation is approximately correct, but not accurate enough.