[
  {"op" : "add", 
    "path" : "/ffveryCommon",
    "value" : {
	"type" : "random",
	"blockProbability" : 0.30
    }
  },
  {"op" : "add", 
    "path" : "/ffCommon",
    "value" : {
	"type" : "random",
	"blockProbability" : 0.080
    }
  },  
  {"op" : "add", 
    "path" : "/ffAverage",
    "value" : {
	"type" : "random",
	"blockProbability" : 0.050
    }
  },    
  {"op" : "add", 
    "path" : "/ffunCommon",
    "value" : {
	"type" : "random",
	"blockProbability" : 0.025
    }
  }, 
  {"op" : "add", 
    "path" : "/ffRare",
    "value" : {
	"type" : "random",
	"blockProbability" : 0.010
    }
  }
]




