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 sunny if and only if James is playing a game. If Joseph were fast, then James is playing a game. Joseph is fast or it is sunny.
If it is sunny, then James is playing a game can be inferred via the biconditional elimination rule. If James plays a game, then it is sunny can be inferred via the biconditional elimination rule.