This is similar to the "Four fours" puzzle, but using the digits 2, 0, 1 and 7.
Rules:
- Use all four digits exactly once
- Allowed operations: +, -, x, ÷, ! (factorial), exponentiation, square root
- Parentheses and grouping (e.g. "21") are also allowed
- Squaring uses the digit 2 so expressions using multiple twos, like $2^2$ or $1^2 + 7^2$, are not allowed
- Keep the order "2017" in at least 16 expressions (and more if you can!)
Good luck and Happy New Year!
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