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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.
Yes, the first sentence in the description was wrong. Sorry for that. This is now fixed and an image was added to outline this.
I think the description was wrong because the wiki says that whatever year the Thursday is in tells what year the week counts as. So on that one the thursday is in 2019 so the first Monday is the start of week 2.