During interleaving, at least one additional read operation is performed, after {HEAD ~ a series} of {TAIL ~ consecutive write} and read operations 
During interleaving , at least one additional read operation is performed , after { HEAD ~ a series } of { TAIL ~ consecutive write } and read operations
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH