Your truth table for Exercise 4.24 will be fairly large. It's good for the soul to build a large truth table every once in a while. Be thankful you have Boole to help you.
This is the only textbook I've ever had that actually succeeds at being witty.
I've been watching Dead Like Me, and I think that if I were to die and be a grim reaper, that would be okay. I just came to the realisation and I thought I should post it.