What is the perimeter of a rectangle made of two squares of 1 cm square?
用2个1平方厘米的正方形拼成一个长方形，它的周长是多少厘米
<gadget id="calculator">1 * 2</gadget>
<output>2</output>

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

<gadget id="calculator">3 * 1 * 2</gadget>
<output>6</output>

<result>6</result>