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 it is sunny. If it is sunny, then Jessica is playing tennis. Jessica is playing tennis if and only if Karen is taking a plane. It is not late. If Jessica plays tennis, then it is sunny.
It is sunny if and only if Jessica is playing tennis can be inferred via the biconditional introduction rule. Jessica is playing tennis if and only if it is sunny can be inferred via the biconditional introduction rule. If it is late, then it is sunny can be inferred via the biconditional elimination rule. If Jessica plays tennis, then Karen is taking a plane can be inferred via the biconditional elimination rule. If it is sunny, then it is late can be inferred via the biconditional elimination rule. If Karen takes a plane, then Jessica is playing tennis can be inferred via the biconditional elimination rule. It is not sunny can be inferred via the biconditional elimination rule.