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_10, if x_10 were an office clerk, then x_10 is running. For all x_10, if x_10 makes tea, then x_10 is bored. For all x_10, x_10 will not go running. There is at least one x_10 for which x_10 is an office clerk or x_10 will make tea.
For all x_10, x_10 is not an office clerk can be inferred via the universal modus tollens rule.