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  1. or download this
     
my $z;
if ($x) {$z  = "true\n"} else {$z  = "false\n"}
  2. or download this
     
my $z = $x ? "true\n" : "false\n";
  3. or download this
      DB<22> 1 ? $a : $b = 1

...
  DB<25> x $a,$b
0  1
1  2