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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.
fixed
The formula OP used is the exact same, aside from removing parentheses which mathematically shouldn't matter anyway.
Sorry, but the formula is written in the description, if you use another one and that fails, it's not a kata issue.