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Then, the lines are appropriately changed (any old yin lines into young yang lines, and any old yang lines into young yin lines), which-with the young lines in the original hexagram remaining the same-results in a second, different, hexagram, the commentarial material on which is then also studied. Then, the commentaries applying to the generated hexagram are studied if the hexagram contains no old lines at all, that concludes the consultation, but if there are one or more old lines, the separate commentary for each such line is also studied. The six lines are produced in order using the chosen method (see below for examples), beginning at the first (lowest) one and proceeding upward to the sixth (uppermost) line, each with its corresponding number. The usual methods for consulting the I Ching as an oracle produce a "sacred" or "ritual" number for each type of line: 6 (for an old yin line), 7 (young yang), 8 (young yin), or 9 (old yang). 2 Probability analysis of I Ching divinationĮach hexagram is six lines, written sequentially one above the other each of the lines represents a state that is either yin (陰 yīn: dark, feminine, etc., represented by a broken line) or yang (陽 yáng: light, masculine, etc., a solid line), and either old (moving or changing, represented by an "X" written on the middle of a yin line, or a circle written on the middle of a yang line) or young (static, unchanging).1.1 Precursor to I Ching: Cracks in turtle shell.