It is easy to write something difficult to difficult or something easy to difficult.

However, it is difficult to write something difficult to easy.

From the viewpoint of the above, the following two books were very interesting for me.

As the former book, I was moved a rough interpretation that I can use interpretation if I have ten data.

As the latter book, I can understand the optimal strategy against bullying in school, that we don't do anything if someone faces bullying. (Of course, there is an explanation against this problem.)

Of course, the interpretation of "Trust in God" as a game strategy, is quite delightful.