$%  [%backlog p=path q=?(%da %dr %ud) r=@]
    [%hola p=path]
    $:  %mess  p=path
      $=  q
        $%  [%do p=@t]
            [%exp p=@t q=tank]
            [%say p=@t]
    ==  ==
    [%tint p=ship]
==