/usr/share/doc/yacas-doc/html/refprogmanual.html is in yacas-doc 1.3.3-2.
This file is owned by root:root, with mode 0o644.
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<frameset border="0" cols="240,*">
<frameset border="0" rows="80,*">
<frame src="manicon.html">
</frame>
<frame src="refprogchapters.html">
</frame>
</frameset>
<frame src="refprogchapter1.html" name="Chapters">
</frame>
</frameset>
</html>
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