{HEAD ~ The basic file system operations} are searching for {TAIL ~ a file} within a directory, reading from a file, and writing to a file 
are searching for
{ HEAD ~ The basic file system operations } are searching for { TAIL ~ a file } within a directory , reading from a file , and writing to a file
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH