One rabbit can exchange for 2 chicks, and one chick can exchange for 3 ducklings, so how many ducklings can one rabbit exchange for?
一只兔子能换2只小鸡，一只小鸡又能换3只小鸭，那么，一只兔子能换多少只小鸭．
<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<result>6</result>