We shall first of all assign numbers for the eight trigrams according to Xian Tian Ba Gua.

We shall use an ordered pair of numbers to represent a hexagram. For example, the hexagram "Heaven on Heaven" is assigned the pair (1,1) and the hexagram "Water on Earth" is assigned the pair (6,8). The first number is the Upper Gua and the second number is the Lower Gua.

The sixty four hexagrams will be easily located in the following "map".

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