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: It is late if and only if Jessica is playing a game. John is a server if and only if Jessica is playing a game.
If it is late, then Jessica is playing a game can be inferred via the biconditional elimination rule. If John were a server, then Jessica is playing a game can be inferred via the biconditional elimination rule. If Jessica plays a game, then it is late can be inferred via the biconditional elimination rule. If Jessica plays a game, then John is a server can be inferred via the biconditional elimination rule.