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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.
It's bad practice to remove them. It's relying on the tests to include them instead, which leaves these solutions prone to being automatically invalidated in the future if the tests change and their solutions don't compile anymore. The line or two saved by omitting them isn't worth that risk, so you're doing good by keeping them in