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\begin{logicproof}{2}
p \implies q & \prem \\
p \land (r \lor q) & \prem \\
\begin{subproof}
q \implies p & \assum \\
r \lor q & $\ande{2} 2$ \\
p & $\ande{1} 2$ \\
q & $\impe 1,5$ \\
(s \land t) \lor q & $\ori{2} 6$ \\
((s \land t) \lor q) \land (r \lor q) & $\andi 7,4$
\end{subproof}
(q \implies p) \implies ((s \land t) \lor q) \land (r \lor q) & $\impi 3-7$
\end{logicproof}