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