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_20, x_20 is a poet if and only if x_20 is an office clerk. Michael is not an office clerk. If it rains, then Michael is a poet.
For all x_20, if x_20 were a poet, then x_20 is an office clerk can be inferred via the universal biconditional elimination rule. For all x_20, if x_20 were an office clerk, then x_20 is a poet can be inferred via the universal biconditional elimination rule.