{17: 1, 18: 1, 19: 1, 20: 1, 23: 1}
{17: 1, 18: 1, 19: 1, 20: 1, 23: 1, 26: 1}
{17: 1, 18: 1, 19: 1, 20: 1, 23: 1, 26: 1}