Consider the following premises. ~S_16(a_16). forall x_16: R_16(x_16) -> S_16(x_16). S_16(a_16) -> R_16(a_16). Can we infer R_16(a_16) from them? If possible, name the inference rules being used at each step.
 From forall x_16: R_16(x_16) -> S_16(x_16) we can infer R_16(a_16) -> S_16(a_16) via universal instantiation. From S_16(a_16) -> R_16(a_16), R_16(a_16) -> S_16(a_16) we can infer S_16(a_16) <-> R_16(a_16) via biconditional introduction. Finally, from S_16(a_16) <-> R_16(a_16), ~S_16(a_16) we can infer ~R_16(a_16) via biconditional elimination, which contradicts R_16(a_16). Therefore, the answer is no.