[Dru89]

Looks like a total of 5: https://hn.algolia.com/?q=psd#!/story/forever/prefix/0/XeePh...

But yeah, I definitely remember seeing this in the past. Feels slightly like a case of http://xkcd.com/1053/, though?

And I don't see anything in the guidelines about re-posts. (https://news.ycombinator.com/newsguidelines.html) You've got more HN experience than me, though, so I could very easily be wrong. :)

[dang]

It's in https://news.ycombinator.com/newsfaq.html. The rule of thumb is that reposts are ok after a year or so.