loop jSON value in jquery

Hey all how can i set this up for a loop?

data.row9_1 

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I cant seem to do it this way:

 var $theRowCount; 
 
 $theRowCount = 9; 
 
 while($theRowCount < 30){ 
    $('#row' + $theRowCount + '_1').html(data.row + $theRowCount + '_1'); 
    $theRowCount ++; 
 } 

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Any ideas would be great!

David