That's not proof. You're going off the assumption you are real before looking for facts, as compared to the opposite, as it's supposed to be.
English
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But if I don't exist, then how can you see me? Touch me? Hear me? Unless of course those are nonexistent too.
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That's like saying how is a hallucinatory oasis in the desert not real if you see it? And I haven't touched you or smelled you or heard you or tasted you.
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No you haven't, physically, but through my typings, you gain a personality on the other side, do you not?
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A personality which I could've thought up for an imaginary person, or a hallucination taking on the personality of a person I may not remember but know deep inside my memory.
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But then how could you know you're imagining it?
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I don't. I must assume as I cannot prove your existence.