Symmetries in Boolean Scan

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Array languages like APL are famous for using many pretty squiggles for representing built-in functions. These are called "primitives" and are different from user-defined functions, because the interpreters know about them and can do fancy optimizations with them, like recognizing special combinations [ 1 ] .

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1. 16:12
   Lobsters 最先出现LLobsters
2. 02:07
   Hacker News 出现讨论HHacker News

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