DeployAnchor:
  type: command
  name: anchor
  - if <player.location.material.name.is[!=].to[air]> {
    - modifyblock <player.location> m@lapis_block
    - flag <player> anchor:+:<player.location>
    - narrate "Your anchor has been saved."
  }
  
PullAnchor:
  type: world
  events:
    on player right clicks lapis_block with air:
    - if <context.location.contains_any[<player.flag[anchor]>]> {
      - modifyblock <context.location> m@air
      - flag player anchor:-:<context.location>
      - narrate "Your anchor has been removed."
    }