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