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function showGraph(){
	  var r1 = parseInt(row1), c1  = parseInt(col1); 
	  var r2 = parseInt(row2), c2 = parseInt(col2);
  if(r2 > r1) {
    var rows = r2 - r1 + 1; var r0 = r1;
  }else{
    var rows = r1 - r2 + 1; var r0 = r2; 
  }
  if(c2 > c1){
   var cols = c2 - c1 + 1; var c0 = c1;
 }else{
   var cols = c1 - c2 + 1; var c0 = c2; 
 }
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