<select>
<optgroup label="Asia">
<option value="ph">Philippines</option>
<option value="kr">South Korea</option>
<option value="jp">Japan</option>
</optgroup>
<optgroup label="Europe">
<option value="fr">France</option>
<option value="de">Germany</option>
<option value="it">Italy</option>
</optgroup>
<optgroup label="North America">
<option value="us">United States</option>
<option value="ca">Canada</option>
<option value="mx">Mexico</option>
</optgroup>
</select>
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