EMYCIN systems sometimes include rules of the form:
A &and B &rarr A
Such a rule is logically redundant, but may serve to increase the CF of the conclusion based on additional evidence.
If; 1) The identity of the snake is rattlesnake, and 2) It bites someone, and 3) He dies Then: There is strongly suggestive evidence (.8) that the identity of the snake is rattlesnake.
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