telephone directory, n.All

A Telephone directory (n.) shows ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠coupling at its barest: the human knows what the rubric names mean, the machine only which tape to start.