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The logic gods have a sick sense of humor. Just when you mastered XOR for two variables (A⊕B) - where it's true when exactly one of them is true - they throw A⊕B⊕C at you and everything breaks down. The smug face turning to horror perfectly captures that moment when you realize three-variable XOR means "an odd number of variables must be true." Suddenly your binary thinking collapses like a poorly designed truth table. Computer science professors secretly enjoy watching students have this existential crisis. It's basically logical hazing.