There are four natural numbers A, B, C, and D, all of which are not equal. The maximum number does not exceed 10, A is twice as large as D, 6 larger than B, 4 larger than C, and C is larger than D. What is the product of these four numbers?
有A、B、C、D四个自然数，且都不相等．最大数不超过10，A是D的2倍，比B大6，比C大4，且C比D大．那么这四个数的积是多少．
<gadget id="calculator">10 - 6</gadget>
<output>4</output>

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

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">10 * 4 * 6 * 5</gadget>
<output>1_200</output>

<result>1_200</result>