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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.
Coding is all about problem solving which this is ;).
Worked perfectly for me. You are over looking some math basics.
I'll attempt to guide you. When solving a math problem you want to wait and round until the end.