The numbers 1337, 1006, and 1981 have something in common, that is, each of them is a four-digit number starting with 1, and each number has exactly two numbers that are the same, so how many such four-digit numbers are there in total?
数1337，1006和1981有某些共同点，即每一个都是以1带头的四位数，且每个数恰好有两个数字相同，那么这样的四位数共有多少个．
<gadget id="calculator">9 * 8 * 3</gadget>
<output>216</output>

<gadget id="calculator">216 + 216</gadget>
<output>432</output>

<result>432</result>