{HEAD ~ A system} includes {TAIL ~ multiple TAP controllers} that can be independently powered up and down 
includes
{ HEAD ~ A system } includes { TAIL ~ multiple TAP controllers } that can be independently powered up and down
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH