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"The topic of which laws support intelligent life at all is a separate interesting topic; we probably won't get to it today.  We're interested in things that stay true even in planes with no intelligent life.  Can you come up with an example of something that has to stay true no matter what laws of the planes you changed?"

Version: 2
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"The topic of which laws support intelligent life is a separate interesting topic; we probably won't get to it today.  We're interested in things that stay true even in planes with no intelligent life.  Can you come up with an example of something that has to stay true no matter what laws of the planes you changed?"

Version: 3
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"The topic of which laws support intelligent life is a separate interesting topic; we probably won't get to it today.  We're interested in things that stay true even in planes with no intelligent life.  Can you come up with an example of something that has to stay true no matter what laws of the planes you change?"