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%indentation = (
                '0' => 1,
                '2' => 3,
                '4' => 2,
);

# Yes, sometimes I write code in ways to make sure _I_ 
# remember what I was doing when I come back to it later.
...
    my $f_temp = $common_indentation_factor = gcf( $f_1, $f_2 );
    push @data, $f_temp;
}