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