“…Sequences have been the subject of research in many disciplines, among which archaeology (McBrearty, 1988), biology (e.g., DNA sequence analysis- Raftery and Tavaré, 1994;Lipman and Pearson, 1984; or even bird songs- Chatfield and Lemon, 1970), chemistry (Xu and Agrawal, 1996), computer sciences (Sabherwal and Robey, 1995), economics (Hopp, 1987), econometrics (Bollerslev et al, 1992), history (Abbott, 1995), linguistics (Jonz, 1989), meteorology (Raftery, 1985a;MacDonald and Zucchini, 1997), psychology (Cohen et al, 1990) and sociology (Abbott and Hrycak, 1990;Katz and Proctor, 1959;Logan, 1981). We define a sequence as a succession of events.…”