{HEAD ~ a second amplifier} configured for amplifying {TAIL ~ the data} received from the second I/O port and outputting the amplified data to the first I/O port 
{ HEAD ~ a second amplifier } configured for amplifying { TAIL ~ the data } received from the second I / O port and outputting the amplified data to the first I / O port
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL 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 OTH OTH OTH