{
   "layers":[
      [ { "name": "n0" }, { "name": "n1" }, { "name": "n2" } ],
      [ { "name": "n3" }, { "name": "n4" }, { "name": "n5" } ],
      [ { "name": "n6" }, { "name": "n7" } ]
   ],
   "edges":[
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      { "source":"n1", "target":"n5" },
      { "source":"n2", "target":"n5" },
      { "source":"n3", "target":"n7" },
      { "source":"n4", "target":"n7" },
      { "source":"n5", "target":"n7" }
   ]
}