Questions about the changes of Zhouyi.

Gossip is gossip. The solid line is Yang, the first is the ninth, the second is the ninth, and the sixth is the ninth. The dotted line is cloudy, the first place is grade six ... and the sixth place is grade six. The eight main hexagrams are transformed into sixty-four hexagrams, which remain unchanged once every six lines, because six lines are heaven positions and there is only one heaven, so they remain unchanged. For example, six solid lines/first dashed line, remaining solid lines/first and second dashed lines, remaining solid lines/no first, second and third dashed lines, remaining solid lines/first, second and third dashed lines, remaining solid lines/first, second, third and fourth dashed lines, and remaining solid lines/first, second, third and fourth dashed lines. The other seven main hexagrams are arranged in this way.