What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Joseph is climbing a mountain or Jessica is making tea. For all x_13, if x_13 were an electrician, then x_13 is working. Jessica is making tea if and only if Sarah is working. Joseph is not climbing a mountain or Sarah is an electrician.
Jessica is making tea or Sarah is an electrician. If Sarah were a musician, then Joseph is not climbing a mountain. If Jessica makes tea, then Sarah is working. If Sarah works, then Jessica is making tea.