/usr/share/doc/libplplot11/examples/octave/ is in octave-plplot 5.9.9-2ubuntu2.
This file is owned by root:root, with mode 0o755.
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/usr/share/doc/libplplot11/examples/octave/CMakeLists.txt
/usr/share/doc/libplplot11/examples/octave/diffn.m
/usr/share/doc/libplplot11/examples/octave/gradn.m
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