Cut out the largest square from a rectangle with a length of 12 cm and a width of 8 cm. What is the perimeter in cm of the remaining part?
从一个长12cm，宽8cm的长方形上剪下一个最大的正方形，剩下部分的周长是多少cm？
<gadget id="calculator">12 - 8</gadget>
<output>4</output>

<gadget id="calculator">4 + 8</gadget>
<output>12</output>

<gadget id="calculator">12 * 2</gadget>
<output>24</output>

<result>24</result>