The title omits the “How” at the beginning.
It’s a Hacker News quirk. I forgot who it was, but one of the people who writes the heuristics for Hacker News submissions decided that, in order to reduce clickbait titles, submissions that start with “How …?” must be rewritten to remove the question that may or may not be answered in the article itself. Sometimes it helps, but most of the time it back fires, see these:
• https://news.ycombinator.com/item?id=4102013
• https://news.ycombinator.com/item?id=21617016
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