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Page 155: Misplaced circled code numbers #86
Halfway down the page is the sentence "Notice that you need to provide only a single template parameter, the return type, upon instantiation (1)(4)."
"Instantiation" seems to refer to the instantiation of the template function, which occurs on the lines marked (2) and (5). Lines (1) and (4) create the integers on which the template functions will operate.