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Given an m x n matrix, return all elements of the matrix in spiral order, starting from the top-left corner and moving clockwise around the matrix until all elements have been visited.
An m x n 2D integer array matrix.
A list of integers contained in the matrix in spiral order.
1 <= m, n <= 10^4 (accounting for total elements <= 10^4); -100 <= matrix[i][j] <= 100