What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all y, y will cook if and only if y will make tea. There is at least one y for which y will not cook. For all y, if y takes a plane, then y is a carpenter. For all y, if y were a carpenter, then y is making tea.
For all y, if y takes a plane, then y is making tea. For all y, if y cooks, then y is making tea. For all y, if y makes tea, then y is cooking. There is at least one y for which y will not make tea.