The four-digit numbers 2336, 2445, 2782, 2116, etc. have some common characteristics. Each number starts with 2, and there are only two identical numbers in each number. How many such four-digit numbers are there?
四位数2336、2445、2782、2116等有一些共同的特征，每个数都以2开头，并且恰好每个数中只有两个相同的数字，这样的四位数一共有多少个？
<gadget id="calculator">3 * 9 * 8</gadget>
<output>216</output>

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

<result>432</result>