This leaves the middle section. Isolating this so we can look at it gives immediately the number of colored surfaces on each of the small cubes composing the middle section. The numbers on the individual small cubes denote the number of colored surfaces on the individual small cubes. This is reassuring. Note that the symmetry of the cube provides and automatic check on the validity of the number of colored faces.
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Please comment . A SureMath solution. Copyright 1998, Howard C. McAllister.