please quickly

Paraphrase the following paragraph: “If a student wants to study at Princeton, he doesn’t really need to apply or pay tuition. He can simply show up and start taking classes. As a professor, I assure you that we make near-zero effort to stop unofficial education; indeed, the rare, earnestly curious student touches our hearts. At the end of four years at Princeton, though, the guerrilla student would lack one precious thing: a diploma. The fact that almost no one tries this route – saving hundreds of thousands of dollars along the way – is a strong sign that students understand the value of certification over actual learning.”

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