If a square with a side length of 4 cm is divided into two identical rectangles, by how many centimeters is the perimeter of each rectangle less than the perimeter of the square?
把一个边长4厘米的正方形分成两个完全一样的长方形，每个长方形周长比正方形周长少多少厘米？
<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">4 + 2</gadget>
<output>6</output>

<gadget id="calculator">6 * 2</gadget>
<output>12</output>

<gadget id="calculator">16 - 12</gadget>
<output>4</output>

<result>4</result>