I can write you one if you wish. Give me about five minutes. Just so you know... it will run, display "Hello world!" and then stop. I can guarantee no bugs. It is software, and it will be bug free.
And before you brush this example off, just bear in mind that it proves that there is software with no bugs. As I said earlier, the more complex the code, the more likely there will be bugs. But there is no way to say, with absolute certainty, that all software has bugs.
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