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<script>
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var x = "x";
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for (var i = 1; i < 23; ++i) {
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x = x + x;
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}
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// x should now be a 2^23 character string, which is 16M in size.
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var y;
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// now append to it repeatedly in a way that prevents buffer sharing
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for (var i = 0; i < 1000; ++i) {
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y = x + i;
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}
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</script>
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