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  1. or download this
            if     ($x == 1) { $abc = 1 }
        elsif ($x == 2) { $def = 1 }
        elsif ($x == 3) { $xyz = 1 }
        else                  { $nothing = 1 }
  2. or download this
        SWITCH: {
        if ($x == 1)    { $abc = 1; last SWITCH; };
...
        if ($x == 3)    { $xyz = 1; last SWITCH; };
        $nothing = 1;
    }
  3. or download this
        SWITCH: for ($x) {
        if (1)    { $abc = 1; last SWITCH; };
...
        if (3)    { $xyz = 1; last SWITCH; };
        $nothing = 1;
    }