Take the following as truth: For example, W shows for leeway the date 1669; from my experience with even above-average users, that is usually taken to mean that 1669 was the first time that leeway appeared in  one day it did not exist; the next, Presto!
Then the following statement: "It is usually taken that 1670 was the first time that leeway appeared." is true, false, or inconclusive?
Answer: False