Presumably, if you can get a machine to grade an essay, couldn't you get one to write one? Perhaps a genetic algorithm combining elements of high scoring essays until it finds the write combination. Perhaps a Markov chain composed of previous high scoring essays. It would be pretty funny to have machines writing essays for other machines to grade in some kind of infinite loop.
Presumably, if you can get a machine to grade an essay, couldn't you get one to write one? Perhaps a genetic algorithm combining elements of high scoring essays until it finds the write combination. Perhaps a Markov chain composed of previous high scoring essays. It would be pretty funny to have machines writing essays for other machines to grade in some kind of infinite loop.