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Descartes Ontological Argument AS

Can someone please help me with evaluating Descartes Ontological Argument. I have some strengths, but I cannot find any strong criticisms.
All help will be very much appreciated, thanks x
Reply 1
Well, there's Gaunilo's Criticism - which states that if I say anything is perfect, then it must exist.
E.g: I can think if a perfect island. Since by definition, I've made it perfect and existence is a perfection, then by definition the island must now exist.

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