{ 1 => [ [1, 2, 3], [6, 7, 8], [16, 17, 18], [26, 27, 28] ], 2 => [ [2, 3, 4], [7, 8, 9], [17, 18, 19], [27, 28, 29] ], 3 => [ [3, 4, 5], [8, 9, 10], [18, 19, 20], [28, 29, 30] ], 4 => [ [4, 5, 6], [9, 10, 11], [19, 20, 21], [29, 30, 31] ], }