<script language="javascript">
function processKey() {
     if( (event.ctrlKey == true && (event.keyCode == 78 || event.keyCode == 82)) || (event.keyCode >= 112 && event.keyCode <= 123) || event.keyCode == 8)
     { 
          event.keyCode = 0; 
          event.cancelBubble = true; 
          event.returnValue = false;
     }
}

document.onkeydown = processKey;
</script>

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