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_25, if x_25 were a bartender, then x_25 is a lawyer. Joseph is writing a letter. Karen is a bartender.
Joseph is writing a letter and Karen is a bartender can be inferred via the conjunction rule. Karen is a bartender and Joseph is writing a letter can be inferred via the conjunction rule. There is at least one x for which x is a bartender can be inferred via the existential generalization rule.