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 z_4, if z_4 were a politician, then z_4 is a poet. There is at least one z_4 for which if z_4 plays tennis, then z_4 is a politician.
There is at least one z_4 for which if z_4 plays tennis, then z_4 is a poet can be inferred via the existential transitivity rule.