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: For all x_16, x_16 will make tea if and only if x_16 is a scientist. If Charles cooks, then Thomas is running. For all x_16, if x_16 were a scientist, then x_16 is cooking. For all x_16, if x_16 were happy, then x_16 is making tea.
For all x_16, if x_16 makes tea, then x_16 is a scientist can be inferred via the universal biconditional elimination rule. For all x_16, if x_16 were a scientist, then x_16 is making tea can be inferred via the universal biconditional elimination rule.