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<script>
/*!
 * @preserve
 * jquery.scrolldepth.js | v1.0
 * Copyright (c) 2016 Rob Flaherty (@robflaherty)
 * Licensed under the MIT and GPL licenses.
 */
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<script>  
jQuery.scrollDepth({
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  userTiming: false,
  pixelDepth: false
});
</script>

function() {
    return Math.floor({{gtm.timerElapsedTime}} / 1000);
}