Secondly, there is the case of timelines that are connected at certain points in time. Unlike the scenario in which travel between universes is always possible through three-dimensional movement, connection between these timelines only occurs at specific times. At these moments, the timelines may be considered as the same universe. For instance, if a timeline splits into two, the timelines were once the same universe before the split occurred. Conversely, if two timelines merge into one, they become the same universe only after they have been fused. In such cases, destruction of a timeline is only accounted for if it was not connected to any other timeline for an infinite amount of time. Conversely, if numerous timelines were never separate for an infinite amount of time, they would be considered as one timeline for the purpose of tiering their destruction or creation.