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Ask HN: What are some interesting papers in CS for a beginner?

I am looking for papers which are easy to understand, papers which are for undergraduates. I often stumble upon papers which require lots of reading to do and soon I have dug into a recursive rabbit hole. I would like to know about papers which have minimal citations/dependencies and only require knowledge of CS basics.

A good example of such paper would be Bitcoin. You don't need to be a CS wizard to understand the paper. Plus, you can ignore the math part and yet appreciate the beauty of Bitcoin.

Some other examples: Bit Torrent, TOTP RFC.