How is the Oracle Bone Inscriptions for divination made and used?

Oracle bones for divination must be corrected first, and then holes should be drilled on the back of the corrected flat Oracle bones. Drilling is to drill a circular groove on the back of Oracle bone according to a certain procedure, and drilling is to drill an oval cavity on one side of the drilled groove. When fired in the connected grooves, the Oracle Bone Inscriptions at the bottom of the grooves is thin. Once cooked, it will burst and crack on the front, which is called a sign. The vertical direction is Cho Chien, and the intersection with Cho Chien is the symbol. The word "Bu" in Oracle Bone Inscriptions's Oracle Inscriptions is a symbolic pictograph. Burning is divination, and people judge the success or failure of the asked affairs by puncturing the divination pattern composed of Cho Chien and Zhao Zhi. On the front of Oracle Bone Inscriptions, next to the symbol, the content of divination is recorded in words, which is Oracle Bone Inscriptions.