{
   "blockType":"when",
   "blockOptions":{
      "method":{
         "name":"not",
         "args":{
            "block":"block"
         }
      }
   },
   "fields":[
      {
         "name":"block",
         "type":"block",
         "value": {
             "blockType":"when",
             "blockOptions":{
                 "method":{
                     "name":"not",
                     "args":{
                         "block":"block"
                     }
                 }
             },
             "fields":[
                 {
                     "name":"block",
                     "type":"block",
                     "value": {
                         __WHEN_BLOCK__
                     }
                 }
             ]
         }
      }
   ]
}