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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.
sorting is unclear. took me some time to figure out, that the original sorting is prefered over a period range.
so if we have [['08:19', '08:20'], ['08:19', '08:21']] as next elements, its unclear if i would choose the entry with longest/shortest duration or the one which would occur first in the original array