{
  "parent": "twilightforest:alt/root",
  "criteria": {
    "ore_map_empty": { "trigger": "minecraft:inventory_changed", "conditions": { "items": [{ "item": "twilightforest:ore_map_empty" }]}},
    "ore_map"      : { "trigger": "minecraft:inventory_changed", "conditions": { "items": [{ "item": "twilightforest:ore_map" }]}}
  },
  "requirements": [
    [ "ore_map_empty", "ore_map" ]
  ]
}