What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Karen is working if and only if Jennifer is playing squash. Karen is not working. If Jennifer plays squash, then it is cold. If it is cold, then Jennifer is playing squash.
Jennifer is playing squash if and only if it is cold. It is cold if and only if Jennifer is playing squash. If Karen works, then Jennifer is playing squash. If Jennifer plays squash, then Karen is working. Jennifer is not playing squash.