In addition to the memory, {HEAD ~ the system} includes {TAIL ~ a write module} and a read module, each of which is coupled to the memory 
In addition to the memory , { HEAD ~ the system } includes { TAIL ~ a write module } and a read module , each of which is coupled to the memory
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 OTH OTH OTH OTH OTH OTH OTH OTH