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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.
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This kata will be a lot harder if you start from scratch, but doing the easier kata in the description should give you a solid structure for this one. The most important topic you should know is how to evaluate a math expression. Hint: an expression of "1 + 2" is in the form called infix notation, you can transform it to other forms for easier parsing.
Thank you:)