what is the river whose source place is guyra and mouth place is guy fawkes river national park ?
SELECT DISTINCT var_uri where brack_open var_uri dbo_sourcePlace dbr_Guyra,_New_South_Wales sep_dot var_uri dbo_mouthPlace dbr_Guy_Fawkes_River_National_Park sep_dot var_uri a dbo_River brack_close