18 lines
309 B
HTML
18 lines
309 B
HTML
<!DOCTYPE html>
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<html lang="en" dir="ltr">
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<head>
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<meta charset="utf-8">
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<title></title>
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</head>
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<body>
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<script>
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var lower = 1;
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var upper = 2;
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alert(lower, upper);
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[lower, upper] = [upper, lower];
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alert(lower, upper);
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</script>
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</body>
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</html>
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