The Setup
Labels are printed with either an A or E on the front and a 2 or 3 on the back. Some of the labels are printed incorrectly, and you are given the job of checking to ensure that if a label has an E on the front, then a 2 is printed on the back. Which of the labels would you have to turn over to make sure that every label with an E on the front also has a 2 on the back?

Table 3

 

 

 

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