A text queries {HEAD ~ search} on the content of text fields for {TAIL ~ approximate matches} to the given text search expression, e.g., the existence of certain phrases or word stems 
A text queries { HEAD ~ search } on the content of text fields for { TAIL ~ approximate matches } to the given text search expression , e.g. , the existence of certain phrases or word stems
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH