What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_10, if x_10 writes a letter, then x_10 is excited. For all x_10, if x_10 were a bartender, then x_10 is excited. For all x_10, if x_10 were poor, then x_10 is writing a letter. There is at least one x_10 for which x_10 is not a bartender. For all x_10, if x_10 were excited, then x_10 is a bartender.
There is at least one x_10 for which x_10 is not excited. For all x_10, if x_10 writes a letter, then x_10 is a bartender. For all x_10, if x_10 were poor, then x_10 is excited. For all x_10, x_10 is a bartender if and only if x_10 is excited. For all x_10, x_10 is excited if and only if x_10 is a bartender.