What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Sarah is a mechanic if and only if it is sunny. Sarah is a mechanic if and only if it is snowing. It is not late. If it is sunny, then it is late.
It is not sunny. If Sarah were a mechanic, then it is sunny. If Sarah were a mechanic, then it is snowing. If it is sunny, then Sarah is a mechanic. If it snows, then Sarah is a mechanic.