A controller may send {HEAD ~ signals} to {TAIL ~ one or more driver circuits} for directing operation of the actuators 
to
A controller may send { HEAD ~ signals } to { TAIL ~ one or more driver circuits } for directing operation of the actuators
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH