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: There is at least one x_6 for which x_6 will work. For all x_6, if x_6 takes a plane, then x_6 is not an artist. For all x_6, x_6 is an artist. For all x_6, x_6 will take a plane or x_6 will drink water.
For all x_6, x_6 will not take a plane can be inferred via the universal modus tollens rule. There is at least one x_6 for which x_6 will work and x_6 is an artist can be inferred via the existential conjunction rule. There is at least one x_6 for which x_6 is an artist and x_6 will work can be inferred via the existential conjunction rule.