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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.
The description of this method is not ideal and it's possible to pass all the "curve" tests while failing the "createFilter" tests.
The "trick" is to know that a filter with keep either removes ONLY one character or keeps ONLY one character. This last bit was the one that forced me to reverse engineer the expected behaviour to satisfy the tests.
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