There is a square iron sheet with a length of 12 decimeters. Cut a square from each of the four corners to make a cuboid water tank with a height of 2 decimeters. What is the volume of this water tank?
有一张长12分米的正方形铁皮，从四个角各剪去一个正方形，做成高是2分米的无盖长方体水箱，这个水箱的容积是多少立方分米？
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">12 - 4</gadget>
<output>8</output>

<gadget id="calculator">8 * 8 * 2</gadget>
<output>128</output>

<result>128</result>