What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all y_4, if y_4 were bored, then y_4 is a politician. David is not bored. For all y_4, if y_4 were a politician, then y_4 is bored.
For all y_4, y_4 is bored if and only if y_4 is a politician. For all y_4, y_4 is a politician if and only if y_4 is bored.