What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all y, y is an electrician if and only if y is a taxi driver. For all y, y is an electrician or y is not curious. For all y, y is not a taxi driver.
For all y, if y were curious, then y is an electrician. For all y, if y were an electrician, then y is a taxi driver. For all y, if y were a taxi driver, then y is an electrician. For all y, y is not an electrician.