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 an electrician. There is at least one x_6 for which x_6 will work. For all x_6, x_6 will play tennis. For all x_6, x_6 is a scientist.
For all x_6, x_6 is an electrician can be inferred via the universal modus ponens rule. For all x_6, x_6 will play tennis 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 play tennis can be inferred via the universal conjunction rule. There is at least one x_6 for which x_6 will work and x_6 will play tennis can be inferred via the existential conjunction rule. There is at least one x_6 for which x_6 will work and x_6 is a scientist can be inferred via the existential conjunction rule. There is at least one x_6 for which x_6 will play tennis and x_6 will work can be inferred via the existential conjunction rule. Some scientists will work can be inferred via the existential conjunction rule.