{HEAD ~ A system} includes {TAIL ~ one or more level sensors} 22 which output signals to a pit volume totalizer 20 and then to a computer 26 
includes
{ HEAD ~ A system } includes { TAIL ~ one or more level sensors } 22 which output signals to a pit volume totalizer 20 and then to a computer 26
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH