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: Karen is playing tennis if and only if it is overcast. It is cloudy if and only if Karen is playing tennis. It is not cloudy.
If Karen plays tennis, then it is overcast can be inferred via the biconditional elimination rule. If it is cloudy, then Karen is playing tennis can be inferred via the biconditional elimination rule. If it is overcast, then Karen is playing tennis can be inferred via the biconditional elimination rule. If Karen plays tennis, then it is cloudy can be inferred via the biconditional elimination rule. Karen is not playing tennis can be inferred via the biconditional elimination rule.