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: Jennifer is not a lawyer. For all x_17, if x_17 were a lawyer, then x_17 is playing a game. Mary is making tea if and only if Jennifer is a lawyer. If Jennifer plays a game, then Mary is making tea.
If Mary makes tea, then Jennifer is a lawyer can be inferred via the biconditional elimination rule. If Jennifer were a lawyer, then Mary is making tea can be inferred via the biconditional elimination rule.