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   $temp_1 = $i;
   $temp_2 = $i;
   $j = $temp_1 + $temp_2;
   $i = $i + 1;
   $i = $i + 1;

Select or download this

   $temp_1 = $i;
   $i = $i + 1;
   $temp_2 = $i;
   $i = $i + 1;
   $j = $temp_1 + $temp_2;