What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all y, if y were an electrician, then y is listening to a song. For all y, if y listens to a song, then y is an electrician. For all y, if y were a writer, then y is an electrician. For all y, y will not listen to a song. For all y, if y were an electrician, then y is a writer.
For all y, y is not an electrician. For all y, if y listens to a song, then y is a writer. For all y, if y were a writer, then y is listening to a song. For all y, y is an electrician if and only if y will listen to a song. For all y, y will listen to a song if and only if y is an electrician. For all y, y is a writer if and only if y is an electrician. For all y, y is an electrician if and only if y is a writer.