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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.
Not always like that but in this test, yes.
The input you are receiving in your "decode" function is the result ("output") of your encode function. Be sure there are no error in the test.
I just tried: no problem. What is your input? Do you modify the given input?