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