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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.
What language?
Yep - it is confusing that the introduction says one should round down to the NEAREST integer - because the nearest integer of 25.6 is 26 which could only be achieved by rounding up ^^