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  1. or download this
    ${ X() } . ${ X() }

concat( deref( X() ), deref( X() ), )
  2. or download this
    ${ X() } . ' ' . ${ X() }

concat( concat( deref( X() ), ' ', ), deref( X() ), )
  3. or download this
    ${ X() } . ${ X() }

concat( new( deref( X() ) ), deref( X() ), )
  4. or download this
    ${ X() } . ' ' . ${ X() }

concat( concat( new( deref( X() ) ), ' ', ), deref( X() ), )
  5. or download this
    use strict;
use warnings;
...
The second concat() copies 1 byte from $b and apend it to that.
1 + 1 + 1 = 3 bytes copied.