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  1. Translation: \\
  2. $p:$ \quad I press the button. \\
  3. $q:$ \quad The window is open.
  4. \begin{tabbing}
  5. If I press the button, the window opens. \quad \= $p \imp q$ \\
  6. I pressed the button. \> $p$ \\
  7. The window is open. \> $q$
  8. \end{tabbing}
  9. \emph{Sequent:} \quad $p \imp q, p \vdash q$ \\
  10. This sequent is provable.
  11. \begin{logicproof}{1}
  12. p \imp q & \prem \\
  13. p & \prem \\
  14. q & $\impe 1,2$
  15. \end{logicproof}