What type of book? Can it be any book?
They are called "Tercet".
Let's say that a clock is broken, so stuck on the time 6:15. While most of the day, that clock is incorrect, it is correct at 6:15 AM and 6:15 PM, thus it is right twice a day.
Answer:
It just plain and simple. It's not special, and It doesn't really state an argument.
Explanation:
