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99 –> 9x9x9 + 9x9x9 = 1458
1458 –> 1x1x1 + + 4x4x4 + 5x5x5 + 8x8x8 = 702
702 –> 7x7x7 + 0x0x0 + 2x2x2 = 351
351 –> 3x3x3 + 5x5x5 + 1x1x1 = 153