The system may also include {HEAD ~ infrared receivers} for receiving {TAIL ~ infrared command signals} from an infrared transmitter 
for receiving
The system may also include { HEAD ~ infrared receivers } for receiving { TAIL ~ infrared command signals } from an infrared transmitter
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH