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  1. or download this
    if ($x = $y) {
   print "$y = $x\n";
}
  2. or download this
    print "$y = $x\n" if ($x = $y);
  3. or download this
    if ($y eq $x) {
 print "$y = $x\n";
...
elsif ($debug eq 1) {
 print "$y != $x\n";
}