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" ... We’ve been able to take that same approach successfully with our symbolic AI reasoners: Whenever the system slows down, we just add more knowledge, more rules, to speed it up. If it’s working in some domain application, we ask the human experts to look over its step by step reasoning trace, to diagnose where it was wasting time. Typically, there was some missing rule of thumb using, that the expert could get to an answer in a few seconds whereas it took the program minutes to deduce the same answer. Adding that meta-level knowledge speeds the program up, incrementally approaching both the correctness and the efficiency of the best humans who solve that sort of domain problem. ... "