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_11, x_11 will write a letter and x_11 will sleep.
For all x_11, x_11 will write a letter can be inferred via the universal simplification rule. For all x_11, x_11 will sleep can be inferred via the universal simplification rule.