What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_7, x_7 will play tennis or x_7 is a bartender. For all x_7, if x_7 plays tennis, then x_7 is a writer. For all x_7, x_7 will write a letter. For all x_7, if x_7 were a bartender, then x_7 is a writer.
For all x_7, x_7 is a writer.