What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_12, x_12 will write a letter and x_12 will drive a car. There is at least one x_12 for which x_12 is happy and x_12 will go running.
For all x_12, x_12 will write a letter. For all x_12, x_12 will drive a car. There is at least one x_12 for which x_12 is happy. There is at least one x_12 for which x_12 will go running.