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  1. or download this
    my $shorter = min( $lenString1, $lenString2 );
my $longer  = max( $lenString1, $lenString2 );
...

## or shorter to longer
my $et = 'DI' x $shorter . 'I' x ( $longer - $shorter );
  2. or download this
    ## longer to shorter
my $et = 'D' x $longer . 'I' x $shorter;

## shorter to longer
my $et = 'D' x $shorter . 'I' x $longer;
  3. or download this
    'the quick brown fox'
'before the quick brown fox'