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 y_2, y_2 will write a letter. For all y_2, y_2 will drink water.
For all y_2, y_2 will write a letter and y_2 will drink water can be inferred via the universal conjunction rule. For all y_2, y_2 will drink water and y_2 will write a letter can be inferred via the universal conjunction rule.