There are 16 variants in Yi Yin by Cao Jiuxi in Bagong.

Yi Yin, edited by Cao Jiuxi, a Gao Shi in Qing Dynasty, preserved many profound and easy-to-learn contents, including the Eight Palace Views, which changed from sixteen ontologies, and belonged to the Najia system, which may be the remains of Yi or an unknown ancient theory. The hexagrams of the Palace Master changed from 16 to 16, and the eight palaces *** 128, that is, 64 hexagrams appeared twice. See Baidu Encyclopedia: Sixteen hexagrams of Fang Jing.