If 4 matchsticks can form a square, what is the minimum number of matchsticks required to form 4 such squares?
4根火柴棒能拼成一个正方形，那么拼成4个这样的正方形最少需要多少根火柴棒．
<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<gadget id="calculator">4 + 6</gadget>
<output>10</output>

<gadget id="calculator">10 + 2</gadget>
<output>12</output>

<result>12</result>