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_12 for which x_12 will play squash or x_12 will sleep. For all x_12, x_12 will make tea. For all x_12, x_12 will not play squash. For all x_12, if x_12 makes tea, then x_12 is a politician.
For all x_12, x_12 is a politician can be inferred via the universal modus ponens rule. There is at least one x_12 for which x_12 will sleep can be inferred via the existential disjunctive syllogism rule.