What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_6, x_6 is not a taxi driver or x_6 will drive a car. There is at least one x_6 for which x_6 will not write a letter or x_6 will play a game. For all x_6, x_6 is a taxi driver. For all x_6, x_6 will not drive a car.
Nothing can be inferred from these premises.