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 cooks, then x_11 is taking a plane. For all x_11, if x_11 were a sailor, then x_11 is taking a plane. For all x_11, x_11 is a sailor or x_11 will cook. For all x_11, x_11 will not take a plane or x_11 is a nurse.
There is at least one x_11 for which x_11 will take a plane can be inferred via the existential disjunction elimination rule.