Imagine you need to take the train and the train schedule is 500 pages. It takes a long time to find the schedule for your stop at 9 AM (when you typically go to work), so once you figure it out you write it down in your notepad and just check the notepad. Unbeknownst to you the train schedule changes and it now arrives at your stop 15 minutes earlier. Until you scratch out that note in your notepad or update it by looking up the updated time, you’re going to miss the train. (Likewise your friend could decide to play a prank on you and rewrite or erase the time in your notepad…)
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