{HEAD ~ The entire operating cycle} comprising all four positionings of the person P in {TAIL ~ the area} 190 requires about 60 seconds 
{ HEAD ~ The entire operating cycle } comprising all four positionings of the person P in { TAIL ~ the area } 190 requires about 60 seconds
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH