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_16, if x_16 were a lawyer, then x_16 is writing a letter. There is at least one x_16 for which if x_16 goes running, then x_16 is writing a letter. For all x_16, if x_16 were a soldier, then x_16 is sleeping. For all x_16, if x_16 sleeps, then x_16 is not writing a letter. For all x_16, x_16 is a lawyer or x_16 will go running.
There is at least one x_16 for which x_16 will write a letter can be inferred via the existential disjunction elimination rule.