Question: Given the predicates P ( x ) : x is a penguin; S ( x ) : x is a seal; N ( x )

Given the predicates P(x) : x is a penguin; S(x) : x is a seal; N(x) : x is nice;
Prove the following argument is valid, citing each property you use: Jed is nice. All penguins are nice. All seals are not nice. Every animal is either a penguin or a seal. Therefore, Jed is a penguin.

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