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import 'dart:io'; void main() { List<List<int>> matrix = [ [0, 2, 4, 6, 1], [1, 5, 4, 1, 1], [7, 1, 0, 8, 0], [9, 3, 8, 1, 1] ]; stdout.write(matrix); } /* run: [[0, 2, 4, 6, 1], [1, 5, 4, 1, 1], [7, 1, 0, 8, 0], [9, 3, 8, 1, 1]] */