class Mar8PartII {
	public static void main(String[] args) {

		int[] arr1 = {1,2,3};
		int[] arr2 = {4,5,6};
		int[] arr3 = {7,8,9};

		int[]	[] matrix = {arr1, arr2, arr3 };

		System.out.println(matrix[0]);
	

		for(int i = 0; i < matrix.length; i++) {
			int[] arr = matrix[i];

			for(int j = 0; j < arr.length; j++) {
				System.out.print(arr[j] + " ");
			}
			System.out.println();
		}
	
		for(int i = 0; i < matrix.length; i++) {
			for(int j = 0; j < matrix[i].length; j++) {
				System.out.print(matrix[i][j] + " ");
			}
			System.out.println();
		}

		int elm = matrix[0][2];
		System.out.printf("elm at row 0, column 2: %d\n", elm);

		matrix[1][1] = 0;
		System.out.printf("elm at row 1, column 1: %d\n", matrix[1][1]);
	}
}