Aha! The third rule she had was that "on" should be used in all cases not explicitly referring to placement of one object atop another (which was where "upon" became acceptable, but not mandatory). Not that you needed to know, or likely care, but I feel better not leaving a discussion incomplete because of my creeping decrepitude.
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branchandroot
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Date: 2011-07-16 12:00 am (UTC)