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spec: The authors write that `` one of the features of fBm is an infinite span of interdependence '' , which seems to contradict the definition that B ( u2 , w ) - B ( u1 , w ) is independent of B ( u4 , w ) - B ( u3 , w ) whenever ( u1 , u2 ) and ( u3 , u4 ) are disjoint . " Amid the many purely personal incidents ( weddings , May Day celebrations , etc ) , there were repeated reports of unusual activity of aircraft and / or rockets being fired in the vicinity .