Which two of the following are MAIN ideas of the article?
Lao-tzu and Confucius were not impressed by each other when they met.
Lao-tzu and Confucius shared ideas about how people should live in unity in the world.
Taoism and Confucianism were written in different books that have been saved in museums.
Taoism and Confucianism are beliefs that have been important to many people.