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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.
Depends on your language. Usually, you just don't export the solution or define a local function/lambda/closure instead of a global one.
Okay. Just a quick edit and I resubmitted.
Take another look at the description :)