What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Mary is climbing a mountain and it is snowing. Sarah is not a cashier. Sarah is a cashier if and only if Elisabeth is running.
Mary is climbing a mountain. It is snowing. If Sarah were a cashier, then Elisabeth is running. If Elisabeth goes running, then Sarah is a cashier. Elisabeth is not running.