Write a logical proof to prove that the following argument is valid.

$p(q^{{?}^{?}}r)$

$pvvs$

$not{s}^{{?}^{?}}t$

:$.r$

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$\text{'}$v$\text{'}$ for logical or

$\text{'}$ N $\text{'}$ for logical and

$\text{'}-\text{'}$ for logical not

$\text{'}->\text{'}$ for implication,

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