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<script>
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var count = 1;
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function run() {
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var div = document.createElement("div");
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div.textContent = "Testing " + (count++);
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document.body.appendChild(div);
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if (count > 10)
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document.body.removeChild(document.body.firstChild);
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}
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setInterval(run, 1000);
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</script>
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