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The mathematics of bell ringing. One thing bell ringers might want to do is ring out all possible combinations of their bells. For example, Plain Bob Minimus is a method that rings all 24 possible combinations of four bells. On the other hand, there are also 24 possible orientations of a cube - in fact underneath the mathematics is the same, and the sequences act as a bridge between the mathematical world of rotations of a cube and the musical world of bell ringing.