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 makes tea, then y is writing a letter. There is at least one y for which if y writes a letter, then y is a scientist. For all y, if y writes a letter, then y is making tea.
There is at least one y for which if y makes tea, then y is a scientist. For all y, y will make tea if and only if y will write a letter. For all y, y will write a letter if and only if y will make tea.