What is the perimeter of a rectangle made of 2 squares with side lengths of 1 cm?
用2个边长1厘米的正方形拼成的长方形的周长是多少厘米．
<gadget id="calculator">1 * 2</gadget>
<output>2</output>

<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<result>6</result>