/usr/share/doc/libprotozero-doc/html/inherit_graph_6.map is in libprotozero-doc 1.5.1-1+deb9u1.
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1 2 3 4 | <map id="Graphical Class Hierarchy" name="Graphical Class Hierarchy">
<area shape="rect" id="node1" href="$classprotozero_1_1pbf__writer.html" title="protozero::pbf_writer" alt="" coords="5,5,160,32"/>
<area shape="rect" id="node2" href="$classprotozero_1_1pbf__builder.html" title="protozero::pbf_builder\< T \>" alt="" coords="208,5,407,32"/>
</map>
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