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Bad command or file name/No Quine
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This is the No_Quine variant of Bad command or file name. It is designed by PSTF.
If the source code is Bad command or file name, then output Hello, world!, otherwise output Bad command or file name.
Example
Hello, World!
Bad command or file name
Quine (I'm going to fool you with invisible characters, lol)
Bad command or file name