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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.
Though you do use "previous week", the description for the desired date range are still unclear. For instance, if today were a Tuesday, "the time period starting on the Monday immediately preceding the current date" would begin yesterday, and then the "following Sunday" would be in the future.
Should include order requirement in instructions; took me forever to figure out why I was passing some tests but not all...