What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: If Mary goes running, then it is late. Mary is running. If it is late, then Thomas is poor. If Karen sleeps, then Thomas is not poor.
It is late can be inferred via the modus ponens rule. If Mary goes running, then Thomas is poor can be inferred via the transitivity rule.