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1·For a pattern to be valid there must be a logical or causative connection between the clustered behaviors, not just a spurious correlation.

如果模式有效，那么在聚集的行为间就必然会有逻辑或者因果关系，而不仅仅是假想的关联。

2·Even if the correlation were not spurious, it would be difficult to know which way causation ran.

即使这个联系不是错误的，也很难知道这种因果关系是以哪种方式运行的。