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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.
From learning point of view, I learnt about comparison op with string but from readability point of view, the solution left me ambigous about why explicit conversion to Integer is not implememted.
It's stated in the instructions that scores are bounded between 0 and 4.