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_13, x_13 is a bartender. For all x_13, x_13 is happy or x_13 is not a lawyer. There is at least one x_13 for which x_13 is a lawyer.
Some lawyers are bartenders can be inferred via the existential conjunction rule. Some bartenders are lawyers can be inferred via the existential conjunction rule. For all x_13, if x_13 were a lawyer, then x_13 is happy can be inferred via the universal rewriting rule.