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: There is at least one x_11 for which if x_11 were excited, then x_11 is reading a book. For all x_11, if x_11 were sad, then x_11 is not reading a book. For all x_11, x_11 will not climb a mountain. For all x_11, x_11 will climb a mountain or x_11 is excited.
For all x_11, x_11 is excited can be inferred via the universal disjunctive syllogism rule.