I worked through many of these when discussed here 7 months ago https://news.ycombinator.com/item?id=12022953 https://news.ycombinator.com/item?id=12022953 ...

I worked through many of these when discussed here 7 months ago https://news.ycombinator.com/item?id=12022953 https://news.ycombinator.com/item?id=12022953 ... really enjoyable, great refresher, and learned some things I never knew before.