π-type talents refer to compound talents who have at least two types of professional skills and can integrate multiple knowledge. The two vertical columns below π refer to two types of professional skills, and the upper one refers to the integration of multiple knowledge. Which of the following are π talents? ['Mr. A. Zhuang has two doctorate degrees in science and management, and is now the boss of a high-tech company. He has many patents and likes cycling in his spare time.', 'Ms. Zhang is a well-known hairdresser. She cuts hair for more than 20 customers every day. Although she is very tired after a day, she will play the piano with her daughter after returning home.', 'Mr. Cao is an expert in the clothing industry. He knows all kinds of clothing styles, fabrics, workmanship, origin and market conditions. He has entered the catering industry several times and has returned home.', 'Lao Zhao is the chef of a hotel, Sichuan, Cantonese, Huaiyang dishes are all good, usually practice calligraphy, singing well, is a famous Mai Ba in the circle of friends.']