{HEAD ~ This invention} relates to {TAIL ~ the analysis} of water to detect the presence of minute amounts of trace contaminants ultra trace level analysis 
{ HEAD ~ This invention } relates to { TAIL ~ the analysis } of water to detect the presence of minute amounts of trace contaminants ultra trace level analysis
HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH