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_8, if x_8 listens to a song, then x_8 is a bartender. For all x_8, if x_8 were a bartender, then x_8 is making tea. For all x_8, if x_8 makes tea, then x_8 is a taxi driver. There is at least one x_8 for which if x_8 were a taxi driver, then x_8 is listening to a song.
For all x_8, if x_8 listens to a song, then x_8 is making tea can be inferred via the universal transitivity rule. For all x_8, if x_8 were a bartender, then x_8 is a taxi driver can be inferred via the universal transitivity rule. There is at least one x_8 for which if x_8 were a taxi driver, then x_8 is a bartender can be inferred via the existential transitivity rule. There is at least one x_8 for which if x_8 makes tea, then x_8 is listening to a song can be inferred via the existential transitivity rule.