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 it is overcast, then Jessica is sleeping. Elisabeth is making tea. Karen is a taxi driver or Jessica is not sleeping. If Elisabeth makes tea, then Karen is a taxi driver.
Karen is a taxi driver can be inferred via the modus ponens rule. If Jessica sleeps, then Karen is a taxi driver can be inferred via the rewriting rule.