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  1. or download this
    $x =($a
       + $b);
    
  2. or download this
    if ( ( $str=~/a\[s\]/ || $str =~/h\[s\]/ ) 
       && ( $str... )   ){
       ....
       }
    
  3. or download this
      1
      2 $a=$b=1;
      3 $x=1 if $a==1
      4      && $b=2;
    
  4. or download this
      2 $a=$b=1;
      3 $x=1 if( $a==1
      4      && $b=2);
    
  5. or download this
    $x=1 if $a{
       $b++
    };