{
   "format_version":"1.13.0",
   "minecraft:feature_rules":{
      "description":{
         "identifier":"true:overworld_underground_potassium_nitrate_ore",
         "places_feature":"true:potassium_nitrate_ore_feature"
      },
      "conditions":{
         "placement_pass":"underground_pass",
         "minecraft:biome_filter":[
            {
               "any_of":[
                  {
                     "test":"has_biome_tag",
                     "operator":"==",
                     "value":"mesa"
                  },
                  {
                     "test":"has_biome_tag",
                     "operator":"==",
                     "value":"desert"
                  },
                  {
                     "test":"has_biome_tag",
                     "operator":"==",
                     "value":"savanna"
                  }
               ]
            }
         ]
      },
      "distribution":{
         "iterations":5,
         "coordinate_eval_order":"zyx",
         "x":{
            "distribution":"uniform",
            "extent":[
               0,
               16
            ]
         },
         "y":{
            "distribution":"uniform",
            "extent":[
               20,
               40
            ]
         },
         "z":{
            "distribution":"uniform",
            "extent":[
               0,
               16
            ]
         }
      }
   }
}