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 is fast if and only if y will write a letter. For all y, y will not write a letter. There is at least one y for which if y cooks, then y is not making tea. For all y, y is fast or y will make tea.
For all y, if y were fast, then y is writing a letter. For all y, if y writes a letter, then y is fast. For all y, y is not fast.