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The leader and most powerful of the nine Ringwraiths , or Black Riders , who serve Sauron in search of the Ring . The trails are suitable for novice or experienced riders , and buggies or wagons on the east and west sides . The basic motorcycle operator training course is for unlicensed or inexperienced riders , and the advanced course is for more experienced riders . " It relates in troublesome ways to other nouns applied to people like us : avocationists , connoisseurs , would-be or pre-professionals , leisure-timers , recreationists , hobbyists or hobby-horse riders , dabblers , dilettantes , novices , freaks , nuts . To guard against ethnic profiling , police will either inspect all riders entering a station or pick out riders on a random numerical basis — every third , or fifth or eighth rider , Transit Police Chief Joseph Carter said .