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  1. or download this
           $b[$i] = $a[$i] + $a[$j];
    
  2. or download this
           for($i=1;$i<=$k;$i++){              # $k = $#a + 1;
                    $j = $i - 1;
    
  3. or download this
           for($i=1;$i<$k;$i++)