seen as the end. On any one circle, can move forward, you can go backwards. So this movement is a rotation of three forms, referred to as "three rotary motion." Yao stop assuming that there is a movement, then it is bound to enclose the two circles, for example, the beginning of Yao does not move, then it closed early, two on Thursday and early, three on five of these two circles; another example Eryao not move, then it is closed by early, two on, four and two, three, four, five of these two circles. However, due to the provisions of the Yi Road, which is the beginning of Liu Yao, two, three, four, five, on such a sequence, so these three circles has become a "cripple", according to "cripple" the running route, three circle to unlock it support, specifically from the beginning, only a quarter of the circle by five first, is a quarter circle, these two arcs "Zhuangruo straight line", scripture On the one called "convergence" and another called "Bu." From two to five, then three-quarters of a circle, which although close to a circle, but it is not a closed circle, the Scriptures do not put this closed circle called "round." If Yao is run entirely in accordance with the