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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 will find that many shell kata's can be solved easier with everything wrapped in a single 'bc' or 'awk' call.
What do you suggest? Change the kyu level? It's not always feasible to make each translation the same difficulty level.