{20: 1, 21: 1, 22: 1, 23: 1, 24: 1, 25: 1} {20: 1, 21: 1, 22: 1, 23: 1, 24: 1, 25: 1, 26: 1} {20: 1, 21: 1, 22: 1, 23: 1, 24: 1, 25: 1, 26: 1, 27: 1}