Distribute 10 identical homework books to four people A, B, C, and D, and each person will get at least 2 homework books. How many different ways are there in total?
把10个相同的作业本发给A、B、C、D四个人，每人至少得到2本，那么一共有多少种不同的分法．
<gadget id="calculator">4 + 6</gadget>
<output>10</output>

<result>10</result>