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Example JSON:
    {
        "A": [[0, 2], [3, 4]],
        "B": [[2, 3], [4, 5], [6, 7], [9, 10], [13, 14], [17, 18]],
        "C": [[5, 6], [8, 9], [12, 13], [16, 17]],
        "D": [[7, 8], [11, 12], [15, 16], [18, 20]],
        "E": [[10, 11], [14, 15]]
    }