The files are grouped into at least one set of files, where the files in the set are accessed together more than {HEAD ~ a predetermined number} of {TAIL ~ times} in the trace 
of
The files are grouped into at least one set of files , where the files in the set are accessed together more than { HEAD ~ a predetermined number } of { TAIL ~ times } in the trace
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH