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I downloaded the maestro edition and was following the starter guide with the Person ontology tutorial. It has been good until i tried the inference example. I clicked "Inference->Run Inferences", in the 'inferences' views, it's empty. nothing inferred. Also with SparQL query, it didn't infer. Should I first configure some reasoners?

SELECT ?subject ?object
WHERE {
    ?subject person:hasChild ?object
}

With the inference configurations, it doesn't show any Williams's children. The message log is below. enter image description here

user697911
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