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In this hour, you learned about Perl's many flow control constructs. Some constructs, such as if and the logical operators, are used to control whether portions of the program run, depending on true or false values. Other constructs, such as while, until, and for, are used for looping over pieces of code as many times as necessary. You also learned what Perl's particular idea of truth is, which is used by virtually all test conditions in Perl.

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