将边长分别为，2，3，4…的正方形的面积记作S1，S2，S3，S4…，计算S2－S1，S3－S2，S4－S3…，若边长为n（n为正整数）的正方形面积记作Sn，根据你计算的规律，猜想：Sn+1－Sn=-

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