{
 "children": [
   {
     "children": [{
       "id": "c",
       "type": "In"
     }],
     "id": "a",
     "type": "Ambient"
   },
   {
     "children": [{
       "id": "c",
       "type": "In"
     }],
     "id": "b",
     "type": "Ambient"
   },
   {
     "children": [{
       "children": [
         {
           "id": "a",
           "type": "In_",
           "children": [{
             "id": "b",
             "type": "In_",
             "children": [{
               "id": "d",
               "type": "In"
             }]
           }]
         }],
       "type": "Serial"
     }],
     "id": "c",
     "type": "Ambient"
   },
   {
     "children": [{
       "id": "c",
       "type": "In_"
     }],
     "id": "d",
     "type": "Ambient"
   }
 ],
 "type": "Parallel"
}