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: R_4(j) <-> s_3. R(j) <-> s_3. forall y_3: R_4(y_3) or R(y_3).
R_4(j) -> s_3 can be inferred via the biconditional elimination rule. R(j) -> s_3 can be inferred via the biconditional elimination rule. s_3 -> R_4(j) can be inferred via the biconditional elimination rule. s_3 -> R(j) can be inferred via the biconditional elimination rule.