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: Richard is bored or Barbara is an astronaut. Richard is not a sailor. For all x_14, x_14 is a sailor if and only if x_14 is bored.
For all x_14, if x_14 were a sailor, then x_14 is bored can be inferred via the universal biconditional elimination rule. For all x_14, if x_14 were bored, then x_14 is a sailor can be inferred via the universal biconditional elimination rule.