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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.
Late reply, but you subtract one number from the "num_pill" since there exist only one space/distance in between two pillars. Same as all real life objects, there exist only one space in between two objects.