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_11, if x_11 makes tea, then x_11 is fast. For all x_11, x_11 is a politician if and only if x_11 is a janitor. For all x_11, x_11 is fast if and only if x_11 is a politician. For all x_11, x_11 is a janitor or x_11 will make tea.
For all x_11, if x_11 were a politician, then x_11 is a janitor can be inferred via the universal biconditional elimination rule. For all x_11, if x_11 were fast, then x_11 is a politician can be inferred via the universal biconditional elimination rule. For all x_11, if x_11 were a janitor, then x_11 is a politician can be inferred via the universal biconditional elimination rule. For all x_11, if x_11 were a politician, then x_11 is fast can be inferred via the universal biconditional elimination rule.