18: 2x9, 9x2, 9+9, 32+32, 54: 6x9, 9x6, 2x3x3x3, 3x6x3, 27: 3x9, 9x3, 3x3x3, 33, 36: 4x9, 9x4, 2x18, 3x4x3, 45: 9x5, 5x9, 5x3x3, 3x5x3, 63: 7x9, 9x7, 3x3x7, 3x7x3, 72: 9x8, 8x9, 8x3x3, 2x4x3x3, 81: 9x9, 92, 32x32, 34,

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