Although this code looks really weird but its 100% valid and works perfectly.
That is because if you use semicolon that just indicates end of a statement and a statement can be empty as well
so ;; just means two empty statement. Likewise you can have as many semicolon as you want and it wont effect you output.
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This is also valid JavaScript. Run it if you don't believe me:
True. There are many tools to do this even
aem1k.com/five/