COMPLEX_SAMPLE_JSON = """
{
  "central_node": "Artificial Intelligence (AI)",
  "nodes": [
    {
      "id": "ml_fundamental",
      "label": "Machine Learning",
      "relationship": "is essential for",
      "subnodes": [
        {
          "id": "dl_branch",
          "label": "Deep Learning",
          "relationship": "for example",
          "subnodes": [
            {
              "id": "cnn_example",
              "label": "CNNs",
              "relationship": "for example"
            },
            {
              "id": "rnn_example",
              "label": "RNNs",
              "relationship": "for example"
            }
          ]
        },
        {
          "id": "rl_branch",
          "label": "Reinforcement Learning",
          "relationship": "for example",
          "subnodes": [
            {
              "id": "qlearning_example",
              "label": "Q-Learning",
              "relationship": "example"
            },
            {
              "id": "pg_example",
              "label": "Policy Gradients",
              "relationship": "example"
            }
          ]
        }
      ]
    },
    {
      "id": "ai_types",
      "label": "Types",
      "relationship": "formed by",
      "subnodes": [
        {
          "id": "agi_type",
          "label": "AGI",
          "relationship": "this is",
          "subnodes": [
            {
              "id": "strong_ai",
              "label": "Strong AI",
              "relationship": "provoked by",
              "subnodes": [
                {
                  "id": "human_intel",
                  "label": "Human-level Intel.",
                  "relationship": "of"
                }
              ]
            }
          ]
        },
        {
          "id": "ani_type",
          "label": "ANI",
          "relationship": "this is",
          "subnodes": [
            {
              "id": "weak_ai",
              "label": "Weak AI",
              "relationship": "provoked by",
              "subnodes": [
                {
                  "id": "narrow_tasks",
                  "label": "Narrow Tasks",
                  "relationship": "of"
                }
              ]
            }
          ]
        }
      ]
    },
    {
      "id": "ai_capabilities",
      "label": "Capabilities",
      "relationship": "change",
      "subnodes": [
        {
          "id": "data_proc",
          "label": "Data Processing",
          "relationship": "can",
          "subnodes": [
            {
              "id": "big_data",
              "label": "Big Data",
              "relationship": "as",
              "subnodes": [
                {
                  "id": "analysis_example",
                  "label": "Data Analysis",
                  "relationship": "example"
                },
                {
                  "id": "prediction_example",
                  "label": "Prediction",
                  "relationship": "example"
                }
              ]
            }
          ]
        },
        {
          "id": "decision_making",
          "label": "Decision Making",
          "relationship": "can be",
          "subnodes": [
            {
              "id": "automation",
              "label": "Automation",
              "relationship": "as",
              "subnodes": [
                {
                  "id": "robotics_example",
                  "label": "Robotics",
                  "relationship": "example"
                },
                {
                  "id": "autonomous_example",
                  "label": "Autonomous Vehicles",
                  "relationship": "of one"
                }
              ]
            }
          ]
        },
        {
          "id": "problem_solving",
          "label": "Problem Solving",
          "relationship": "can",
          "subnodes": [
            {
              "id": "optimization",
              "label": "Optimization",
              "relationship": "as is",
              "subnodes": [
                {
                  "id": "algorithms_example",
                  "label": "Algorithms",
                  "relationship": "for example"
                }
              ]
            }
          ]
        }
      ]
    }
  ]
}
"""