dges
  var edges = new vis.DataSet([
    {from: 1, to: 3},
    {from: 1, to: 2},
    {from: 2, to: 4},
    {from: 2, to: 5},
    {from: 2, to: 6},
    {from: 4, to: 7},
  ]);

  // create a network
  var container = document.getElementById('mynetwork');
  var data = {
    nodes: nodes,
    edges: edges
  };
  var options = {
    nodes: {borderWidth: 2},
    interaction: {hover: true}
  }
  var network = new vis.Network(container, data, options);
</script>

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