/usr/ is in libduppy-ocaml-dev 0.5.1-1build1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/ocaml/
/usr/lib/ocaml/duppy/
/usr/lib/ocaml/duppy/pa_duppy.cmi
/usr/lib/ocaml/duppy/duppy.cmi
/usr/lib/ocaml/duppy/duppy.cmx
/usr/lib/ocaml/duppy/duppy.a
/usr/lib/ocaml/duppy/META
/usr/lib/ocaml/duppy/pa_duppy.cmo
/usr/lib/ocaml/duppy/duppy.cmxa
/usr/lib/ocaml/duppy/duppy.cma
/usr/lib/ocaml/duppy/libduppy_stubs.a
/usr/lib/ocaml/duppy/duppy.mli
/usr/lib/ocaml/duppy/pa_duppy.mli
/usr/share/
/usr/share/doc/
/usr/share/doc/libduppy-ocaml-dev/
/usr/share/doc/libduppy-ocaml-dev/html/
/usr/share/doc/libduppy-ocaml-dev/html/Duppy.Monad.Condition.Factory.html
/usr/share/doc/libduppy-ocaml-dev/html/index_values.html
/usr/share/doc/libduppy-ocaml-dev/html/Duppy.Monad.Mutex.Mutex_t.Control.html
/usr/share/doc/libduppy-ocaml-dev/html/index_types.html
/usr/share/doc/libduppy-ocaml-dev/html/type_Duppy.Monad.Mutex.html
/usr/share/doc/libduppy-ocaml-dev/html/type_Duppy.Monad.Mutex.Factory.html
/usr/share/doc/libduppy-ocaml-dev/html/type_Pa_duppy.html
/usr/share/doc/libduppy-ocaml-dev/html/type_Duppy.Monad.Mutex.Mutex_t.html
/usr/share/doc/libduppy-ocaml-dev/html/Duppy.Monad.html
/usr/share/doc/libduppy-ocaml-dev/html/Duppy.Monad.Mutex.Factory.html
/usr/share/doc/libduppy-ocaml-dev/html/index_attributes.html
/usr/share/doc/libduppy-ocaml-dev/html/type_Duppy.Monad.html
/usr/share/doc/libduppy-ocaml-dev/html/type_Duppy.Monad.Condition.html
/usr/share/doc/libduppy-ocaml-dev/html/Duppy.Io.html
/usr/share/doc/libduppy-ocaml-dev/html/type_Duppy.Monad.Condition.Factory.html
/usr/share/doc/libduppy-ocaml-dev/html/index_methods.html
/usr/share/doc/libduppy-ocaml-dev/html/index_class_types.html
/usr/share/doc/libduppy-ocaml-dev/html/style.css
/usr/share/doc/libduppy-ocaml-dev/html/Pa_duppy.html
/usr/share/doc/libduppy-ocaml-dev/html/type_Duppy.Monad.Io.html
/usr/share/doc/libduppy-ocaml-dev/html/index_modules.html
/usr/share/doc/libduppy-ocaml-dev/html/Duppy.Monad.Mutex.html
/usr/share/doc/libduppy-ocaml-dev/html/type_Duppy.html
/usr/share/doc/libduppy-ocaml-dev/html/Duppy.Monad.Mutex.Mutex_t.html
/usr/share/doc/libduppy-ocaml-dev/html/index_exceptions.html
/usr/share/doc/libduppy-ocaml-dev/html/type_Duppy.Monad.Mutex.Mutex_control.html
/usr/share/doc/libduppy-ocaml-dev/html/Duppy.Monad.Io.html
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/usr/share/doc/libduppy-ocaml-dev/html/Duppy.Monad.Mutex.Mutex_control.html
/usr/share/doc/libduppy-ocaml-dev/html/type_Duppy.Io.html
/usr/share/doc/libduppy-ocaml-dev/html/index.html
/usr/share/doc/libduppy-ocaml-dev/html/index_module_types.html
/usr/share/doc/libduppy-ocaml-dev/html/type_Duppy.Monad.Mutex.Mutex_t.Control.html
/usr/share/doc/libduppy-ocaml-dev/html/Duppy.Async.html
/usr/share/doc/libduppy-ocaml-dev/html/Duppy.Monad.Condition.html
/usr/share/doc/libduppy-ocaml-dev/html/index_classes.html
/usr/share/doc/libduppy-ocaml-dev/html/Duppy.html
/usr/share/doc/libduppy-ocaml-dev/html/type_Duppy.Async.html
/usr/share/doc/libduppy-ocaml-dev/html/Duppy.Task.html
/usr/share/doc/libduppy-ocaml-dev/changelog.Debian.gz
/usr/share/doc/libduppy-ocaml-dev/copyright
/usr/share/doc/libduppy-ocaml-dev/README
/usr/share/doc-base/
/usr/share/doc-base/libduppy-ocaml-dev