{HEAD ~ The bounding data values} for the set of metrics characterize {TAIL ~ the bounding web site} 
characterize
{ HEAD ~ The bounding data values } for the set of metrics characterize { TAIL ~ the bounding web site }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL