An infinite loop
Louis Reasoner mistakenly deletes the outranked-by rule (section 4.4.1) from the data base. When he realizes this, he quickly reinstalls it. Unfortunately, he makes a slight change in the rule, and types it in as
(rule (outranked-by ?staff-person ?boss) (or (supervisor ?staff-person ?boss) (and (outranked-by ?middle-manager ?boss) (supervisor ?staff-person ?middle-manager))))
Just after Louis types this information into the system, DeWitt Aull comes by to find out who outranks Ben Bitdiddle. He issues the query
(outranked-by (Bitdiddle Ben) ?who)
After answering, the system goes into an infinite loop. Explain why.
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