So that the individual can compare the differences. What's important is event. And people are living in the era well. What is growth or decline in that period clearly.
Hospitality, you can compare the differences of each era, there is an event important and what people in that era lives. What is growth or decline in that era.
เพื้อ, you can compare the difference of each era, What is the main event and the people who are in the era of the life, it is how it is, there is nothing to prosper or decline in the era of the clearly.