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my $mode = 'old';
my $entry_mode = $mode;
$entry_mode = 'new';
print $mode;  # Still 'old'.

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($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,