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@ProfKinyon @ben_golub Mine was 8th grade, taught about 15 years later by Mr. Klutch (yes, Dick Klutch!), who also used wax markers on transparency rolls and I understand worked with Fehr. You’re making me want to eBay copies of our textbooks (which he wrote)! archive.org/details/mathematicstopic0000bumb/page/n6/mode/1up