<a a="5" b="{@a}+1" c="{@b}/3">
	<b1 />
	<b2>
		<c a="38" e="{@a}" s="{@a}+{@e}"/>
	</b2>
	<b3>
		<d z="551" k="21" q="{@z}*{@k}" w="{@q}/{@k}"/>
	</b3>
</a>

<a a="5" b="5+1" c="5+1/3">
	<b1 />
	<b2>
		<c a="38" e="38" s="38+38"/>
	</b2>
	<b3>
		<d z="551" k="21" q="551*21" w="551*21/21"/>
	</b3>
</a>