{HEAD ~ The system} includes {TAIL ~ an indication mechanism} to indicate that the information file has sufficiently changed 
includes
{ HEAD ~ The system } includes { TAIL ~ an indication mechanism } to indicate that the information file has sufficiently changed
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH