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_13, x_13 will make tea if and only if x_13 is a janitor. If it is sunny, then Patricia is making tea. If Patricia were a janitor, then it is windy.
For all x_13, if x_13 makes tea, then x_13 is a janitor can be inferred via the universal biconditional elimination rule. For all x_13, if x_13 were a janitor, then x_13 is making tea can be inferred via the universal biconditional elimination rule.