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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.
Tests strictly requires return type to be a
set
, rather than a sequence (which would be a iterable). A set is also not a sequence, so the output as specified by the description is misleading.