Put two squares with a perimeter of 8 decimeters together to form a large rectangle. What is the perimeter of this rectangle in decimeters?
把两个周长都是8分米的正方形拼成一个大长方形，这个长方形的周长是多少分米？
<gadget id="calculator">8 / 4</gadget>
<output>2</output>

<gadget id="calculator">2 + 2</gadget>
<output>4</output>

<gadget id="calculator">4 + 2</gadget>
<output>6</output>

<gadget id="calculator">6 * 2</gadget>
<output>12</output>

<result>12</result>