Loading collection data...
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.
why even mention books? Try reading it again substituting "medical conditions", "pokemon", or "opinions". Makes about the same amount of sense to me.
why are the codes 3,4,5 or more letters long?
I'd probably solve the problem quicker if just given the inputs and outputs and "good luck"