What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? It is not cold. Elisabeth is playing squash if and only if David is a bartender. It is cold if and only if Elisabeth is playing squash. For all y_3, if y_3 were fast, then y_3 is a bartender.
If Elisabeth plays squash, then David is a bartender. If it is cold, then Elisabeth is playing squash. If David were a bartender, then Elisabeth is playing squash. If Elisabeth plays squash, then it is cold. Elisabeth is not playing squash.