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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.
I am also having the same error. What is passed in as parameters is not in our control - so it must be bug.
I have experienced the same issue here.
For sample test 1 and 4 there is missing the empty string as second
function parameter.
Also I am experiencing very often 429 error only with this test.