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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.
"I have developed an elegant solution to this problem."
1 minute later. . .
"Oh, there was already a method for that."
Are you sure that you're allowing for the second argument being optional? If so, you'll have to show me your code so that I can see what's going on (you can spoiler flag it).