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_26, if x_26 were a taxi driver, then x_26 is sleeping. Mary is sad and John is playing squash. For all x_26, x_26 is a musician or x_26 is a taxi driver. For all x_26, if x_26 sleeps, then x_26 is bored. For all x_26, if x_26 were a musician, then x_26 is sleeping.
Mary is sad can be inferred via the simplification rule. John is playing squash can be inferred via the simplification rule. For all x_26, if x_26 were a taxi driver, then x_26 is bored can be inferred via the universal transitivity rule. For all x_26, if x_26 were a musician, then x_26 is bored can be inferred via the universal transitivity rule. For all x_26, x_26 will sleep can be inferred via the universal disjunction elimination rule.