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On vs. Upon
Are there strong rules for the use of either "on" or "upon" in a sentence?
Is it just a matter of style and formality or is there a concrete reason to use one or the other?
I know you can't start a story "Once on a time..."
However, these examples don't quite have the same dissonance to my ear:
"I can make adjustments based on/upon your suggestions."
"The cat is on/upon my head!"
"On/upon reflection, I'm going to side with the watermelon."
What are your thoughts on/upon this?
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Building an artificial intelligence that appreciates Mozart is easy. Building an A.I. that appreciates a theme restaurant is the real challenge - Kit Roebuck - Nine Planets Without Intelligent Life
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