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: Elisabeth is playing a game or Joseph is excited. Elisabeth is playing a game if and only if Patricia is poor. For all x_17, x_17 is not poor.
If Elisabeth plays a game, then Patricia is poor can be inferred via the biconditional elimination rule. If Patricia were poor, then Elisabeth is playing a game can be inferred via the biconditional elimination rule.