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We can avoid this in two ways. Firstly, we can declare that any code that observes two nodes must depend on those nodes, and then apply the topological sort we described earlier. Alternatively, we can declare that any code that might be able to observe two nodes can only be run after all nodes have finished running2. These both work, but again they require us to be able to observe the full dependency tree and topologically sort all nodes.，详情可参考超级权重
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