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, x_5 is happy. For all x_5, if x_5 were happy, then x_5 is a musician. For all x_5, if x_5 were a musician, then x_5 is playing a game. There is at least one x_5 for which if x_5 were a server, then x_5 is playing a game.
For all x_5, x_5 is a musician can be inferred via the universal modus ponens rule. For all x_5, if x_5 were happy, then x_5 is playing a game can be inferred via the universal transitivity rule.