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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.
What does l, c and ch stand for would be a question one would have when first seeing the code so it's not good. Understandable variables is most important.
Good but "tg" is not a good variable name. Better to actually use "totalGoals" when it takes 1 second more and is a lot nicer to read and understand.