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\begin{logicproof}{1}
p \imp \lnot q & \prem \\
q & \prem\\
\begin{subproof}
p & \assum \\
\lnot q & $\impe 3,1$\\
\bot & $\nege 2,4$
\end{subproof}
\lnot p & $\negi 3-5$
\end{logicproof}