/usr/ is in libchewing3-dev 0.5.1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/
/usr/include/x86_64-linux-gnu/
/usr/include/x86_64-linux-gnu/chewing/
/usr/include/x86_64-linux-gnu/chewing/chewing-compat.h
/usr/include/x86_64-linux-gnu/chewing/chewing.h
/usr/include/x86_64-linux-gnu/chewing/chewingio.h
/usr/include/x86_64-linux-gnu/chewing/global.h
/usr/include/x86_64-linux-gnu/chewing/mod_aux.h
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/chewing.pc
/usr/share/
/usr/share/doc/
/usr/share/doc/libchewing3-dev/
/usr/share/doc/libchewing3-dev/README.Debian
/usr/share/doc/libchewing3-dev/copyright
/usr/share/info/
/usr/share/info/libchewing.info.gz
/usr/lib/x86_64-linux-gnu/libchewing.so
/usr/share/doc/libchewing3-dev/changelog.Debian.gz