A pair of split and join nodes encompassing multiple parallel routes can reside on a parallel route in the scope of another pair of split and join nodes.
包含多条平行线路的一对分离/连接节点可能出现在另一对分离/连接节点的一条平行线路上。
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In fact, a pulsar seems to be fleeing from the fast-spinning star, suggesting the two were once a pair that split up when a companion star exploded and became the pulsar we see today.