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 z_1, z_1 is curious if and only if z_1 is an artist. If Richard were curious, then it is raining.
For all z_1, if z_1 were curious, then z_1 is an artist can be inferred via the universal biconditional elimination rule. For all z_1, if z_1 were an artist, then z_1 is curious can be inferred via the universal biconditional elimination rule.