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 x_8, x_8 is curious if and only if x_8 is fast. There is at least one x_8 for which if x_8 were a writer, then x_8 is fast. For all x_8, x_8 is not curious.
For all x_8, if x_8 were curious, then x_8 is fast can be inferred via the universal biconditional elimination rule. For all x_8, if x_8 were fast, then x_8 is curious can be inferred via the universal biconditional elimination rule. For all x_8, x_8 is not fast can be inferred via the universal biconditional elimination rule.