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The negation of $\sim s \vee(\sim r \vee s)$ is equivalent to
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$s \wedge r$
$\begin{aligned} & \sim\{\sim s \vee(\sim r \wedge s)\} \equiv \sim(\sim s) \wedge\{\sim(\sim r \wedge s)\} \\ & \equiv s \wedge\{\sim(\sim r) \vee \sim s\} \\ & \equiv s \wedge\{r \vee \sim s\} \\ & \equiv(s \wedge r) \vee(s \wedge \sim s) \\ & \equiv(s \wedge r) \vee c \\ & \equiv(s \wedge r)\end{aligned}$
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