name the river with source as duck creek and river mouth is located in duck river ?
SELECT DISTINCT var_uri where brack_open var_uri dbo_riverMouth dbr_Duck_River_ attr_open New_South_Wales attr_close sep_dot var_uri dbo_source dbr_Duck_Creek_ attr_open Clyde,_New_South_Wales attr_close sep_dot var_uri a dbo_River brack_close