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: There is at least one x_14 for which if x_14 were curious, then x_14 is a writer. For all x_14, x_14 is a writer if and only if x_14 is curious. For all x_14, x_14 is fast if and only if x_14 is curious.
For all x_14, if x_14 were a writer, then x_14 is curious can be inferred via the universal biconditional elimination rule. For all x_14, if x_14 were fast, then x_14 is curious can be inferred via the universal biconditional elimination rule. For all x_14, if x_14 were curious, then x_14 is a writer can be inferred via the universal biconditional elimination rule. For all x_14, if x_14 were curious, then x_14 is fast can be inferred via the universal biconditional elimination rule.