However, this ease and simpliciy involves a tradeoff in that this solution takes longer than other solutions that are harder and more complex. Instead of being named Up and Down and represented in moves by U and D, the horizontal faces are named Top and Bottom and represented by T and B. To avoid the single-letter ambiguity, the rear face is called Posterior and represented by P. Additionally, clockwise and anticlockwise moves are indicated by + and -, respectively, instead of bare letters and primes.
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