Retrieving the target file is made impractical by the deletion of {HEAD ~ the reference} to {TAIL ~ the target file} in the directory manager file 
to
Retrieving the target file is made impractical by the deletion of { HEAD ~ the reference } to { TAIL ~ the target file } in the directory manager file
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH