What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If it snows, then Susan is a janitor. Sarah is making tea if and only if Jessica is playing squash. Sarah is not making tea. Susan is not a janitor.
It is not snowing. Sarah is not making tea and Susan is not a janitor. Susan is not a janitor and Sarah is not making tea. If Sarah makes tea, then Jessica is playing squash. If Jessica plays squash, then Sarah is making tea. Jessica is not playing squash.