<s:set var="americanCars" value="{'Ford','GMC','Lincoln','Audi'}"/>
<s:set var="europeanCars" value="{'Audi','BMW','VM'}"/>
<s:set var="japaneseCars" value="{'Honda','Nissan','Toyota','VM'}"/>
<s:merge var="allCars">
	<s:param value="#americanCars"/>
	<s:param value="#europeanCars"/>
	<s:param value="#japaneseCars"/>
</s:merge>

<s:iterator value="allCars" status="stat">
	<s:property />
</s:iterator>