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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.
Wow that's much shorter than mine! :) Grok should have introduced sum() instead of using loops to calculate sum.
I get the same error. What is the workaround?