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_5, if x_5 makes tea, then x_5 is a soldier. For all x_5, x_5 is a poet if and only if x_5 is a soldier. For all x_5, x_5 is a poet.
For all x_5, if x_5 were a poet, then x_5 is a soldier can be inferred via the universal biconditional elimination rule. For all x_5, if x_5 were a soldier, then x_5 is a poet can be inferred via the universal biconditional elimination rule.