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, x is an artist if and only if x is a soldier. There is at least one x for which if x were a soldier, then x is an artist. For all x, x is not a soldier.
For all x, if x were an artist, then x is a soldier can be inferred via the universal biconditional elimination rule. For all x, if x were a soldier, then x is an artist can be inferred via the universal biconditional elimination rule. For all x, x is not an artist can be inferred via the universal biconditional elimination rule.