Previous Parts: Part 1: https://news.ycombinator.com/item?id=24517792 https://news.ycombinator.com/item?id=24517792 Part 2: https://news.ycombinator.com/item?

Previous Parts: Part 1: https://news.ycombinator.com/item?id=24517792 https://news.ycombinator.com/item?id=24517792 Part 2: https://news.ycombinator.com/item?id=24591216 https://news.ycombinator.com/item?id=24591216 Part 3: https://news.ycombinator.com/item?id=24668125 https://news.ycombinator.com/item?id=24668125