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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.
You should not declare a global variable and reuse it in your function as the scoping varies which can cause unexpected behaviour like the one you have experienced!
center around the max value. the max value is already provided.
Look for patterns. How much should each be indented, does that relate to any other known information?