Choose three numbers from the four number cards of 0, 6, 7, and 9 to place a three-digit number. How many three-digit numbers can be placed in total? Please write down the possible three-digit numbers in order below.
在0，6，7，9四张数字卡片中选三个数字摆三位数，共可以摆出多少个三位数？请在下面有序写出可能摆出的三位数．
<gadget id="calculator">3 * 3 * 2</gadget>
<output>18</output>

<result>18</result>