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