“…This is the definition of END sequences. For the details about the concept and the probability limit theory of END sequence, one can refer to Liu [9], Chen et al [3], Shen [17], Wang and Chen [34], Wang and Wang [24], Wang et al [28,29,32], Qiu et al [13], and so forth. If both (1.1) and (1.2) hold for g L (n) = g U (n) = 1 for any n ≥ 1, then the random variables {X n , n ≥ 1} are called negatively orthant dependent (NOD, in short).…”