What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all y_2, y_2 is a lawyer if and only if y_2 will write a letter. If Robert writes a letter, then Robert is a lawyer. For all y_2, if y_2 were a lawyer, then y_2 is writing a letter.
For all y_2, if y_2 were a lawyer, then y_2 is writing a letter. For all y_2, if y_2 writes a letter, then y_2 is a lawyer.