Why is it sometimes necessary for a scanner to "look" at the upcoming characters?

Enhanced Discovering Computers 2017 (Shelly Cashman Series) (MindTap Course List)
1st Edition
ISBN:9781305657458
Author:Misty E. Vermaat, Susan L. Sebok, Steven M. Freund, Mark Frydenberg, Jennifer T. Campbell
Publisher:Misty E. Vermaat, Susan L. Sebok, Steven M. Freund, Mark Frydenberg, Jennifer T. Campbell
Chapter1: Introducing Today's Technologies: Computers, Devices, And The Web
Section: Chapter Questions
Problem 6TF
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Why is it sometimes necessary for a scanner to "look" at the upcoming characters?

 

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