PREFIX : <http://example/>


:x :r :z .
:a :b :c .
<<:a :b :c>> :r :z .
<<:x :r :z >> :p <<:a :b :c>> .

<< <<:x :r :z >> :p <<:a :b :c>> >>
   :q
<< <<:x :r :z >> :p <<:a :b :c>> >> .