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 it is windy. If Jessica were happy, then it is windy. If it is windy, then Sarah is playing squash. For all y, y is happy.
If Jessica were happy, then Sarah is playing squash. If it is sunny, then it is windy. If it is windy, then it is sunny.