As far as finding the murderer is concerned, although there are twists and turns, the murderer's trick is slightly simpler and less detailed than some American dramas. What if Fermat turned back and didn't meet the police? The old man is going to fight one against three and then break through the wall to escape?
As far as the math puzzles in the movie are concerned, it is not difficult for the Chinese audience cultivated by years of test-oriented education. Well, I admit that the title of the hourglass did not come to my mind.
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