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The difference is the precedence.

From perlop:

As more readable alternatives to "&&" and "||" when used for control flow, Perl provides "and" and "or" operators (see below). The short-circuit behavior is identical. The precedence of "and" and "or" is much lower, however, so that you can safely use them after a list operator without the need for parentheses:

In reply to Re: && and and (well, you try searching for an answer) by explorer
in thread && and and (well, you try searching for an answer) by Melly

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