What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Mary is not a janitor. For all x_13, x_13 will make tea if and only if x_13 is a janitor. It is cold.
Mary is not a janitor and it is cold. It is cold and Mary is not a janitor. For all x_13, if x_13 makes tea, then x_13 is a janitor. For all x_13, if x_13 were a janitor, then x_13 is making tea.