There is not a single word in it, but why is it folded into a triangle? With an oriental mindset, one would definitely think that this is what the professor told Martin. It was empty inside, but he had already told the other party what he wanted to say. This thing depends on "comprehension"...
In other words, except for Beth who killed her mother and the driver who killed the patient, everything else died of natural causes, and the professor was just playing tricks. And the professor's stick student, what are the four letters written?
It's over, it's empty...
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