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BJP4 Self-Check 1.6: legalIdentifiers

Language/Type: Java basics syntax
Author: Roy McElmurry (on 2016/09/08)
Note: We often receive emails from users claiming that this problem is wrong, or has a bug, or does not accept the correct solution. No; it does not. If your answer is being marked as incorrect, it is because your answer is incorrect.
Which of the following can be used in a Java program as identifiers? Check all of the identifiers that are legal.
(order shuffled)

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