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 James were a politician, then Susan is making tea. If Elisabeth takes a plane, then Susan is making tea. James is a politician or Elisabeth is taking a plane. Thomas is driving a car if and only if Susan is making tea. Elisabeth is playing a game.
Susan is making tea can be inferred via the disjunction elimination rule. If Thomas drives a car, then Susan is making tea can be inferred via the biconditional elimination rule. If Susan makes tea, then Thomas is driving a car can be inferred via the biconditional elimination rule.