CORRECT ANSWER = 770 - 222 BCE. (3 points)

In the Warring States Period (770-222 BCE), people carved 45 ideograph Qigong formulas for making Qi flow on jade girdle pendants in pictures as well as characters. It states, "To make Qi flow feely, one must be smooth and steady. In this way, Qi can be preserved and extended deeply throughout the body..."