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<style>
div {text-align:center;}
span {margin-right:10px;}
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<body>
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var n = 20 ;
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var aDiv = new Array();
var aSpan = new Array();
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aDiv[i] = document.createElement("div");
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aDiv[i].appendChild(aSpan[j])
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document.body.appendChild(aDiv[i]);
}
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</body>
</html>