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    For a bit more clarity, redux means

    1. Analyze first element (impossible since you need a pair)
    2. Analyze first two elements in list (should be trivially easy
    3. Analyze first three elements in list
    4. Analyze first four elements in list
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    Even though 3 comes after the frist 5, 7 comes before the 2nd 5. Hence, 3,7 as a pair comes earlier.