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Because the twelve terms of the Duodecad enable us to consider it in terms of hexads, tetrads and triads, it has proved easier to utilize than the ten and eleven term systems. On theoretical grounds, we assume that the dodecad represents the ultimate resolution of problems of hazard. It gives a total survey of any region of experience and has been applied extensively to categorize: levels of existence; qualities of energy; substances; essence classes; values, and roles in an ideal human society. The duodecad can be considered as two hexads, upper and lower; as three tetrads, working in dynamic cooperation; or as four triads in a synthesis of immanence and transcendence.