class Thief
  public method steal(v as Vault)
    v.secret = 1
    v.shown = 2
    v.lock()
    v.open()
    v.make().hidden = 3
    v.missing = 4
    v.shown(1)
  end method
end class

interface Peek
  method look() as Vault
end interface

class Vault implements Peek
  private word secret
  public word shown
  word hidden
  private method lock()
  end method
  method open()
    self.lock()
    self.secret = 1
    hidden = 2
  end method
  public method peer(other as Vault)
    other.secret = 2
  end method
  public method make() as Vault
    return self
  end method
  public method look() as Vault
    return self
  end method
end class

program Main
  var v as Vault
  var list as Vault[2]
  var p as Peek
  v = new Vault()
  v.hidden = 1
  list[0].secret = 5
  print v.shown
  p = v
  p.look().secret = 6
  p.touch()
  v.open()
end program