Press the right key for the next slide (or swipe left)
Press the left key to go backwards (or swipe right)
Press n to toggle whether notes are shown (no equivalent if you don't have a keyboard)
Press m or double tap to see a menu of slides
If she has seen it, I am dead.
A → B
That's not true.
¬(A → B)
If she has seen it, I am not dead.
A → ¬B