What will the code below output to the console and why?

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1. console.log(1 + +"3" + "3");
2. console.log(1 +"3" + "3");
3. console.log(1 + -"1" + "3");
4. console.log(+"1" + "1" + "3");
5. console.log("X" - "Y" + "3");
6. console.log("X" - "Y" + 3);