Verify the validity of the argument: All lions are fierce. Some lions do not drink coffee. Hence some fierce creatures do not drink coffee.” (Lewis Carrol)
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-By the second premise, we have that there is a lion that does not drink coffee, let it be Leo
-Using simplification we can tell that Leo is a lion.
-Now using modus ponens on the first premise we know that Leo is fierce.
-So Leo is fierce and doesn't drink coffee.
-Now using existential generalization, we can say that there exists creature that is fierce, and does not drink coffee.
Hence the argument is valid