Human knowledge might come from experiments, experience, et cetera. This standard can be applied rigorously to conditions and causation too. Instead of taking necessary conditions for granted, human beings are challenged to consider what allows us to know about this relationship. Methods: The usual mathematical rules were used. Examples are presented to illustrate the methods developed in detail. Results: Of two events, A and B, we say that A is a necessary condition for B when an event B

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... occur without an event A. Conclusion: It is possible to detect necessary condition relationships (within a dataset).