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 x_1 for which if x_1 were fast, then x_1 is an electrician. For all x_1, x_1 is fast or x_1 will listen to a song. For all x_1, if x_1 listens to a song, then x_1 is a nurse. For all x_1, if x_1 were a nurse, then x_1 is an electrician.
For all x_1, if x_1 listens to a song, then x_1 is an electrician.