What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? It is sunny if and only if Sarah is a poet. Patricia is writing a letter or it is not cloudy. If Patricia writes a letter, then it is sunny. Sarah is not a poet.
If it is cloudy, then Patricia is writing a letter. If it is sunny, then Sarah is a poet. If Sarah were a poet, then it is sunny. It is not sunny.