solution.json

{
    "1": [
        [
            1,
            2
        ],
        [
            2,
            3
        ],
        [
            3,
            4
        ],
        [
            4,
            5
        ],
        [
            5,
            1
        ]
    ],
    "2": [
        [
            1,
            12
        ],
        [
            12,
            13
        ],
        [
            13,
            14
        ],
        [
            14,
            15
        ],
        [
            15,
            1
        ]
    ],
    "3": [
        [
            1,
            9
        ],
        [
            9,
            7
        ],
        [
            7,
            10
        ],
        [
            10,
            11
        ],
        [
            11,
            1
        ]
    ],
    "4": [
        [
            1,
            6
        ],
        [
            6,
            8
        ],
        [
            8,
            1
        ]
    ]
}