different versions of the same binary package.
A relocatable program can be moved or copied to a different location
-on the filesystem. It is possible to make symlinks to the installed
+on the file system. It is possible to make symlinks to the installed
and moved programs, and invoke them through the symlink. It is
possible to do the same thing with a hard link @emph{only} if the hard
link file is in the same directory as the real program.