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Who said the following?
"what is isn't and what isn't is"
I can't remember where I picked up that line but I seem to remember hearing it being repeated by some fictional character, possibly cartoonish.
To quote Aristotle “Affirming nonexistence of the extent, or existence of the nonexistent, is falsehood; but affirming existence of the existent, and nonexistence of the nonexistent, is truth.”
Required, but never shown