on player closes inventory:
  - foreach <context.inventory.list_contents> {
    - if <s@scriptname.yaml_key[whitelist].contains[<def[value]>].not> {
      - ADD <def[value]> TO A LIST
      - drop <def[value]> <player.location.cursor_on>
    }
  }
  - yaml id:myfile set my.path:<context.inventory.list_contents.exclude[THE_LIST]>
  - yaml "savefile:/Myfile.yml" id:myfile