/usr/share/doc/libsignon-qt/html/classSignOn_1_1AuthSession__inherit__graph.map is in libsignon-qt-doc 8.58+16.04.20151106-0ubuntu1.
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The actual contents of the file can be viewed below.
1 2 | <map id="SignOn::AuthSession" name="SignOn::AuthSession">
</map>
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