There are 1 yuan, 5 jiao, 2 jiao, and 1 jiao banknotes. Li Yi wants to take out two banknotes. How many different ways are there to hold them? Please list them out.
有1元、5角、2角、1角的纸币各一张，李义要从中拿出两张，有多少种不同的拿法？请你列举出来．
<gadget id="calculator">3 + 2 + 1</gadget>
<output>6</output>

<result>6</result>