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_5, if x_5 were excited, then x_5 is a taxi driver. There is at least one x_5 for which if x_5 were a musician, then x_5 is a cashier. For all x_5, if x_5 were a cashier, then x_5 is a server. For all x_5, if x_5 were a server, then x_5 is excited.
For all x_5, if x_5 were a cashier, then x_5 is excited can be inferred via the universal transitivity rule. For all x_5, if x_5 were a server, then x_5 is a taxi driver can be inferred via the universal transitivity rule. There is at least one x_5 for which if x_5 were a musician, then x_5 is a server can be inferred via the existential transitivity rule.