Thanks so much for the new concurrency section, I really appreciate it! They're a lot of fun, and helpful.

But 4 questions is hardly enough. Would it be possible for some of the classics to be added?

• Multi-threaded Fizz Buzz (probably the easiest to add into the existing system).
• Dining Philosophers (Possibly challenging to add, depending on how its phrased, but would be so awesome!)
• Producer-Consumer (I reckon not too difficult to add?)