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  Name:     state() - get the 2 digit state abbr. based on zipcode
  Usage:    <state> = state(<zipcode>)
  Params:   string <zipcode> - the zip code to check as a string

  Returns:  a string equal to the 2 digit state code that pertains
            to the specified zip code, or null if not found or error.

 ---------------------------------- Example ---------------------------------

                 mzip = space(10)
                 @ 10,0 say "Enter zip:" get mzip pict "99999-9999"
                 read
                 ? "State is: "+state(mzip)

  Note:     This function relies on the same table used by iszip().
            Please refer to the notes in the iszip() function for
            important information about ranges of zip codes.