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How is の being used here?

> 今日は、色々な日本一と世界一の話をしました

Source: <https://cijapanese.com/no-1-in-japan-vs-no-1-in-the-world/>
CC BY-SA 4.0
2022-02-03T12:14:25.317
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2022-02-03T16:02:58.783
50205
question
grammar particle-の
〜の：今日は、色々な日本一と世界一の話をしました
This の marks the genitive case. You can read more
[here](https://wildnihongo.com/grammar/no-genitive/).

Here, と is used to list nouns exhaustively. Nouns that are listed by this と
create a noun phrase and can therefore occur in places where nouns can:

  * 日本一と世界一 | Noun phrase

Note that 話をします is a verb phrase consisting of a noun, 話. This noun is
modified by this other one 日本一と世界一 through の, meaning "a talk **about**
Japan's best and the world's best."
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2022-02-03T16:02:58.783
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2022-02-03T16:02:58.783
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answer