\begin{logicproof}{2} q \imp r & \prem \\ \begin{subproof} p \lor q & \assum\\ \begin{subproof} p & \assum \\ p \lor r & $\ori{1} 2$ \end{subproof} \begin{subproof} q & \assum \\ r & $\impe 5,1$ \\ p \lor r & $\ori{2} 6$ \end{subproof} p \lor r & $\ore 2,3-4,5-7$ \end{subproof} p \lor q \imp (p \lor r) &$\impi 2-8$ \end{logicproof}