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<form action="action_page.php" id="carform">
Firstname:<input type="text" name="fname">
<input type="submit">
</form>
<br>
<select name="carlist" form="carform">
<option value="PHP">PHP</option>
<option value="Python">Python</option>
<option value="C#">C#</option>
<option value="Golang">Golang</option>
</select>