Not part of Tetrad but more philosophical see: Glymour, C., and Wimberly, F. Actual Causes and Thought Experiments, in Joseph Keim Campbell, Michael O'Rourke, Harry S. Silverstein (eds.), Causation and Explanation, MIT Press, Cambridge, July 2007.
--- Frank C. Wimberly 505 670-9918 Santa Fe, NM
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