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Mathematical problems, what is a square matrix, and why the difference between two adjacent layers of a square matrix is 8.
Simply put, a square matrix is a matrix with equal rows and columns.

There are 8 people on each floor. Total number of people: 28 +36+44 +52+60=220 (people) Features of a hollow square: the difference between the sides of two adjacent floors is 2, and the difference between the layers of two adjacent floors is 8. There are 60 people on the outermost layer.

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