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: Jennifer is not an artist. Jennifer is a police officer if and only if it is overcast. For all x_21, x_21 is an artist if and only if x_21 is a police officer.
If Jennifer were a police officer, then it is overcast can be inferred via the biconditional elimination rule. If it is overcast, then Jennifer is a police officer can be inferred via the biconditional elimination rule. For all x_21, if x_21 were an artist, then x_21 is a police officer can be inferred via the universal biconditional elimination rule. For all x_21, if x_21 were a police officer, then x_21 is an artist can be inferred via the universal biconditional elimination rule.