Divide a rectangle with a length of 8 cm and a width of 4 cm into nine small rectangles whose side lengths are integers. Please show that at least two of these rectangles are identical.
把长8厘米，宽4厘米的长方形分成九个边长是整数的小长方形，请说明这些长方形中至少有2个是完全相同的．
<gadget id="calculator">1 * 1 * 2 * 1 * 1 * 2 * 8</gadget>
<output>32</output>

<result>32</result>