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_9, if x_9 plays a game, then x_9 is taking a plane. For all x_9, if x_9 were a poet, then x_9 is taking a plane. There is at least one x_9 for which x_9 will play a game or x_9 is a poet. For all x_9, x_9 will make tea.
There is at least one x_9 for which x_9 will take a plane can be inferred via the existential disjunction elimination rule.