{HEAD ~ The circuit} requires {TAIL ~ reduction} of the engine speed to a speed below the lower response speed in order to restore the response speed of the speed responsive control to the predetermined speed 
requires
{ HEAD ~ The circuit } requires { TAIL ~ reduction } of the engine speed to a speed below the lower response speed in order to restore the response speed of the speed responsive control to the predetermined speed
HEAD HEAD HEAD HEAD HEAD HEAD REL 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 OTH OTH