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: If it is cloudy, then Linda is a sailor. Robert is playing a game if and only if Linda is a sailor. Robert is not playing a game.
If Robert plays a game, then Linda is a sailor can be inferred via the biconditional elimination rule. If Linda were a sailor, then Robert is playing a game can be inferred via the biconditional elimination rule. Linda is not a sailor can be inferred via the biconditional elimination rule.