What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_12, x_12 is a bartender or x_12 is sad. There is at least one x_12 for which x_12 is a taxi driver or x_12 is not a bartender. For all x_12, if x_12 were sad, then x_12 is a taxi driver.
There is at least one x_12 for which if x_12 were a bartender, then x_12 is a taxi driver.