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 cold or Karen is not playing tennis. Karen is playing tennis if and only if it is cold.
If Karen plays tennis, then it is cold can be inferred via the rewriting rule. If Karen plays tennis, then it is cold can be inferred via the biconditional elimination rule. If it is cold, then Karen is playing tennis can be inferred via the biconditional elimination rule.