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, x_10 is poor. For all x_10, if x_10 were a sailor, then x_10 is curious. For all x_10, if x_10 takes a plane, then x_10 is not poor. There is at least one x_10 for which if x_10 were curious, then x_10 is taking a plane.
For all x_10, x_10 will not take a plane can be inferred via the universal modus tollens rule. There is at least one x_10 for which if x_10 were a sailor, then x_10 is taking a plane can be inferred via the existential transitivity rule.