{TAIL ~ The system} applies the candidate transformation rules to {HEAD ~ the selected query element} to generate a transformed query element that includes a transformed remote query element 
{ TAIL ~ The system } applies the candidate transformation rules to { HEAD ~ the selected query element } to generate a transformed query element that includes a transformed remote query element
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH