{HEAD ~ The system} may also include {TAIL ~ an infrared transmitter} for transmitting infrared command signals to a keypad controller having an internal infrared receiver or to an external infrared receiver adjacent one of the drive units 
include
{ HEAD ~ The system } may also include { TAIL ~ an infrared transmitter } for transmitting infrared command signals to a keypad controller having an internal infrared receiver or to an external infrared receiver adjacent one of the drive units
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL 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 OTH OTH OTH OTH OTH OTH