What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_4, x_4 is a mechanic if and only if x_4 will make tea.
For all x_4, if x_4 were a mechanic, then x_4 is making tea. For all x_4, if x_4 makes tea, then x_4 is a mechanic.