Mistake: Reappearing gun sight:
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Advance to time index 0: 30: 31 and you will see that there is no gun sight on
the tip of Billy’s gun. However, at time index 0: 30: 32 there is a gun sight
at the tip of the gun. The gun sight disappears again at time index 0: 30: 35,
reappears at 0: 30: 37, then disappears again at 0: 30: 39.
