What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all y_3, y_3 will play tennis. There is at least one y_3 for which y_3 is a mechanic. For all y_3, if y_3 were a mechanic, then y_3 is reading a book.
There is at least one y_3 for which y_3 will read a book. Some mechanics will play tennis. There is at least one y_3 for which y_3 will play tennis and y_3 is a mechanic.