Vyxal, 2 bytes ∆² Try it Online! Woooooooo built-in elements ftw.
posted 3y ago by lyxal
# [Vyxal](https://github.com/Vyxal/Vyxal), 2 bytes ``` ∆² ``` [Try it Online!](https://lyxal.pythonanywhere.com?flags=&code=%E2%88%86%C2%B2&inputs=%5B1%2C2%2C3%2C4%2C5%2C6%2C7%2C8%2C9%5D&header=&footer=) Woooooooo built-in elements ftw.