My wife, who has reached the age of childbirth, has a very strict personality, so she usually carries this "rhythm notebook", a so-called "ovulation notebook". A notebook with detailed information such as the ovulation cycle, body temperature, the day when menstruation began, and more specifically, the day when I worked hard with my husband's servant to make children. However, it seems that my wife dropped the important "ovulation notebook" somewhere on the way home from shopping the other day. I searched for it in a hurry, but in the end I gave up without coming out ...