The side length of a square is 2 cm. If two such small squares are put together to form a rectangle, what is the perimeter of the rectangle in cm?
正方形的边长是2厘米，两个这样的小正方形拼成一个长方形，长方形的周长是多少厘米．
<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>