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## More Or Less
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### Instructions
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Create 4 functions:
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- `more` that takes 1 argument and adds 1 to it.
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- `less` that takes 1 argument and subtracts 1 from it.
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- `add` that takes 2 arguments and adds them together.
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- `sub` that takes 2 arguments and subtracts the second argument from the first.
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All the functions must return the result of the operations specified above.
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### Notions
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- [Functions](https://nan-academy.github.io/js-training/examples/functions.js)
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- [Primitives and Operators](https://nan-academy.github.io/js-training/examples/primitive-and-operators.js)
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