Use 3 cubes with edge length of 2cm to form a cuboid, how much will the surface area be reduced in cm**2.
用3块棱长为2cm的正方体拼成一个长方体，表面积减少多少cm**2．
<gadget id="calculator">2 * 2 * 4</gadget>
<output>16</output>

<result>16</result>