title: Unique Word Extraction
body: <p>Hello Friends: i have a list of words separated by Comma"," .e.g  Location, Organization,Person, Location, Person,Date,Organization,Date,Location,Person.
  Now my problems is that how to extract unique words e.g Location,Organization, Person,date 
  out of the above listed words and after extraction how to store these unique words in an array.</p>