Do you have a source for this? What threshold is needed for it to be 'dense'? | Hacker News

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dividefuel 4 months ago | parent | context | favorite | on: Why Japan has such good railways

Do you have a source for this? What threshold is needed for it to be 'dense'?

zhdc1 4 months ago [–]

My source -> https://i.kym-cdn.com/photos/images/newsfeed/003/033/089/164...

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