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<div>
<span style="font-weight:normal">font-weight : normal</span>
<span style="font-weight:bold">font-weight : bold</span>
<span style="font-weight:bolder">font-weight : bolder</span>
<span style="font-weight:lighter">font-weight : lighter</span>
<span style="font-weight:100">font-weight : 100</span>
<span style="font-weight:200">font-weight : 200</span>
<span style="font-weight:300">font-weight : 300</span>
<span style="font-weight:400">font-weight : 400</span>
<span style="font-weight:600">font-weight : 600</span>
<span style="font-weight:900">font-weight : 900</span>
</div>
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div {font-style:normal; font-family:Arial}