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Imagine that you are given one pair, "abc" and "def". Then, then next pair might be "a" and "bcdef". These are two distinct pairs, but if you just concatenate them, they both become "abcdef", and won't be counted seperately!
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Imagine that you are given one pair, "abc" and "def". Then, then next pair might be "a" and "bcdef". These are two distinct pairs, but if you just concatenate them, they both become "abcdef", and won't be counted seperately!