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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.
Read the posts below, it's been already asked and answered more than once.
Falseis in the input value. The first of those is what your function returned, not the input.