A set of rules shown below uses certainty factors for assessing chest pain complaints.

Determine the certainty of heart disease if the patient suffers from chest pain and his or her electrocardiogram is positive. Provide a full trace of the reasoning process.

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control of Rule: 1 if chest pain is true then heart disease is true {cf 0.1} Rule: 2 if electrocardiogram is positive then heart disease is true {cf 0.7} Rule: 3 if electrocardiogram is negative then heart disease is true {cf 0.05} /*The SEEK directive sets up the goal of the rule set seek heart disease