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10 × 10 10 × 12 8 × 9 5 × 6
5×2 × 5×2 5×2 × 6×2 4×2 × 3×3 5×1 × 3×2 100:5×2×5×2 120:5×2×6×2 72:4×2×3×3 30:5×1×3×2