What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: For all x_3, x_3 will play a game. For all x_3, x_3 will not play a game or x_3 is a soldier. There is at least one x_3 for which x_3 will not write a letter.
Nothing can be inferred from these premises.