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Provide a Conterexample in a Finite Domain to Each Given

Question 167

Essay

provide a conterexample in a finite domain to each given invalid argument.
-1. (∃x)Sx
2. (∀x)[Sx ⊃ (Tx ⊃ ∼Ux)]
3. Ua • Ub
4. (∃x)∼Ux / (∃x)(Sx • ∼Tx)

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