{HEAD ~ Electronic device} 500 can be realized by {TAIL ~ a number} of separate physical units or it can also be realized as a “system on chip” 
{ HEAD ~ Electronic device } 500 can be realized by { TAIL ~ a number } of separate physical units or it can also be realized as a “ system on chip ”
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH