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  • For C, A comes first, B comes after.

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  • For D, B comes first, A comes after.

If we assume the existence of an absolute time line, then either A or B is first. Apart from that, A and B are the “creators” and C and D are the “observers”

C might claim to B that he is “slower than A”. But to begin with.

  • C is just a consumer, not a producer.
  • C is slower than B, not A.

I wonder what this leads to…


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