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_3, if z_3 were a soldier, then z_3 is curious. For all z_3, if z_3 were curious, then z_3 is a soldier. For all z_3, z_3 is not curious. It is windy if and only if Thomas is a soldier.
If it is windy, then Thomas is a soldier can be inferred via the biconditional elimination rule. If Thomas were a soldier, then it is windy can be inferred via the biconditional elimination rule. For all z_3, z_3 is not a soldier can be inferred via the universal modus tollens rule. For all z_3, z_3 is a soldier if and only if z_3 is curious can be inferred via the universal biconditional introduction rule. For all z_3, z_3 is curious if and only if z_3 is a soldier can be inferred via the universal biconditional introduction rule.