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_7, x_7 will not play tennis or x_7 is a writer. Jennifer is an astronaut. For all x_7, x_7 is not an astronaut or x_7 is a taxi driver.
There is at least one x for which x is an astronaut can be inferred via the existential generalization rule.