Chapter 5

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Korobushka
Traditional Russian song used as a musical track on Tetris. Pynchon also referenced Tetris in Against the Day [1]

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the li'l goombas of Web design
a reference to Super Mario Bros.

Fabian's Bit Bucket
In computing, the bit bucket is jargon for where lost computerized data has gone, by any means; any data which does not end up where it is supposed to, being lost in transmission, a computer crash, or the like, is said to have gone to the bit bucket — that mysterious place on a computer where lost documents go, as in: "What happened to that important spreadsheet that I was just editing?" OR "Oh, it went into the bit bucket." Wikipedia entry

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Dr. Zizmor
A physician whose subway ads were all over the NYC subway for 30 years.