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: Joseph is sleeping if and only if it is windy. For all x_23, x_23 will make tea. It is not windy. For all x_23, x_23 will not make tea.
Since the premises are contradictory, we can infer anything from them.