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// 2D array = multi-dimensional array that stores a matrix // of data in rows and columns. // Useful for games, spreadsheets, or representing images const matrix = [ [1, 2, 3], [4, 5, 6], [7, 8, 9]]; //matrix[0][0] = 'X'; //matrix[0][1] = 'O'; //matrix[0][2] = 'X'; //matrix[1][0] = 'O'; //matrix[1][1] = 'X'; //matrix[1][2] = 'O'; //matrix[2][0 ...

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