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<style type="text/css">
	optgroup {overflow-x: hidden;}
</style>
<select>
<select>
  <optgroup label="optgroup">
  <option>1</option>
  <option>2</option>
  <option>3</option>
  <option>4</option>
  <option>4</option>
  <option>5</option>
  <option>6</option>
  <option>7</option>
  <option>8</option>
  <option>9</option>
  <option>9</option>
  <option>10</option>
  <option>11</option>
  <option>12</option>
  <option>13</option>
  <option>14</option>
  <option>14</option>
  <option>15</option>
  <option>16</option>
  <option>17</option>
  <option>18</option>
  <option>18</option>
  <option>19</option>
  <option>20</option>
</optgroup>
</select>