What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? There is at least one x_6 for which if x_6 writes a letter, then x_6 is working. For all x_6, if x_6 were a writer, then x_6 is writing a letter. For all x_6, x_6 is a writer if and only if x_6 will work.
There is at least one x_6 for which if x_6 were a writer, then x_6 is working. For all x_6, if x_6 were a writer, then x_6 is working. For all x_6, if x_6 works, then x_6 is a writer.