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<grammar xmlns="http://relaxng.org/ns/structure/1.0">
<start>
<ref name="top"/>
</start>
<define name="empty">
<empty/>
</define>
<define name="top">
<element name="top">
<choice>
<ref name="empty"/>
<element name="a">
<text/>
</element>
</choice>
</element>
</define>
</grammar>
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