A rectangular piece of paper 10 decimeters long and 6 decimeters wide. Cut a largest square out of it, what is the perimeter of the remaining part in decimeters?
一张长10分米，宽6分米的长方形纸片．在上面剪出一个最大的正方形，剩余部分的周长是多少分米？
<gadget id="calculator">10 - 6</gadget>
<output>4</output>

<gadget id="calculator">6 + 4</gadget>
<output>10</output>

<gadget id="calculator">10 * 2</gadget>
<output>20</output>

<result>20</result>