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  1. or download this
    $s = 'the quick brown fox';;
$r = \substr $s, 10, 5;;
...

print $s;;
the quick green fox
  2. or download this
    $r2 = $r;;
$$r2 = 'orange';;

print $s;;
the quick orange fox
  3. or download this
    print Dump $r2;;

...
      PV = 0x182a7bc "the quick orange fox"\0
      CUR = 20
      LEN = 21