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#!/usr/bin/perl
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use strict;
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use warnings;
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my %hash = ('Key1' => 'Value1', 'Key2' => 'Value2');
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print "$hash{Key1}\n"; # print 'Value1'
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foreach (keys %hash) {
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$hash{$hash{$_}} = $_;
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delete $hash{$_};
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}
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print "$hash{Value1}\n"; # print 'Key1' |