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This link has been posted several times before (https://www.hnsearch.com/search#request/all&q=97+program...). What's the HN best practice for this?

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I guess "You should post again when you read it and find it interesting, independently from previous postings". HN detects reposts, but I don't know the algorithm.

The other day it didn't let me repost a link last posted almost 2 years ago.

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