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$a || $b # logical or: true if either is nonzero
$a && $b # logical and: true only if both are nonzero
! $a # logical not: true if $a is zero
Perl 5 also defines these logical operators:
$a or $b # another form of logical or
$a and $b # another form of logical and
not $a # another form of logical not
$a xor $b # logical xor: true if either $a or $b is nonzero, but not both
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