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  1. or download this
      $a = 3 # no semi needed here
  if ($a == 5) { print "b" }
  2. or download this
      $a = 3
  3. or download this
      $a = 3 if ($a == 5)
  4. or download this
      $a = 3 if ($a == 5); { print "b" }