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Exemplars:
(1989 [1]), (1990 [2-5]), (1991 [6-9]), (1992 [10-13]), (1993 [14-17]), (1994 [18-21]), (1995 [22-25]), (1996 [26-29]), (1997 [30-31, 33]), (1998 [34-35, 37]), (1999 [38, 39]); (2001 [44]), (2002 [47-49]), (2004 [52-53]); (2005 [54]), (2006 [55-56]), (2008 [59])
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