[
[(1, 3), (5,7)],
[(21, 23), (25,27)]
];
[
[(9,11), (13,15)],
[(29,31), (33,35)]
];
[
[(17,19)],
[(37,39)]
];

[
[(41, 43), (45,47)],
[(61, 63), (65,67)]
];
[
[(49,51), (53,55)],
[(69,71), (73,75)]
];
[
[(57,59)],
[(77,79)]
];

[
[(81,83), (85,87)]
];
[
[(89,91), (93,95)]
];
[
[(97,99)]
]
