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_6, if x_6 were a scientist, then x_6 is fast. For all x_6, x_6 will sleep. For all x_6, x_6 is a scientist. For all x_6, if x_6 were fast, then x_6 is an electrician.
For all x_6, x_6 is fast can be inferred via the universal modus ponens rule. For all x_6, if x_6 were a scientist, then x_6 is an electrician can be inferred via the universal transitivity rule. For all x_6, x_6 will sleep and x_6 is a scientist can be inferred via the universal conjunction rule. For all x_6, x_6 is a scientist and x_6 will sleep can be inferred via the universal conjunction rule.