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_4, if x_4 plays squash, then x_4 is an artist. There is at least one x_4 for which x_4 is a soldier. For all x_4, if x_4 were a server, then x_4 is an artist. For all x_4, x_4 will play squash or x_4 is a server.
For all x_4, x_4 is an artist can be inferred via the universal disjunction elimination rule.