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 curious if and only if Charles is playing a game. Charles is playing a game if and only if Jessica is playing tennis. Richard is not curious.
If Richard were curious, then Charles is playing a game can be inferred via the biconditional elimination rule. If Charles plays a game, then Jessica is playing tennis can be inferred via the biconditional elimination rule. If Charles plays a game, then Richard is curious can be inferred via the biconditional elimination rule. If Jessica plays tennis, then Charles is playing a game can be inferred via the biconditional elimination rule. Charles is not playing a game can be inferred via the biconditional elimination rule.