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Dimensions are divided into 4 types.
Type 1 dimensions are common. Most of the time matter can move in and out with no limitations, but in some cases various matter limitations might apply. A typical scenario is a time shift, when a dimension is completely identical, but shifted into either past or future.
Dimensions which have no matter limitations and yet do not spill into other dimensions are classified as Type 2. These dimensions require the Normal Portal to be accessed.