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<select id="combo4" style="width: 200px;" onchange="$('input#text4').val($(this).val());">
    <option>option 1</option>
    <option>option 2</option>
    <option>option 3</option>
</select>

<input id="text4" style="margin-left: -203px; width: 180px; height: 1.2em; border: 0;" />