migration-class.json

{
  "nodes": [
    {
      "name": "Seconde D"
    },
    {
      "name": "Première A"
    },
    {
      "name": "Première B"
    },
    {
      "name": "Seconde A"
    }    
  ],
  "links": [
    {
      "source": 0,
      "target": 1,
      "value": 10
    },
    {
      "source": 0,
      "target": 2,
      "value": 5
    },
    {
      "source": 3,
      "target": 2,
      "value": 10
    }
  ]
}