. _:b1216810 . _:b1216807 . _:b1216808 _:b1216807 . _:b1216806 . _:b1216806 . _:b1216809 _:b1216808 . _:b1216810 . _:b1216806 _:b1216809 . _:b1216807 . "grain of acid dune sand"^^ . . "ENVO"^^ . _:b1216810 . _:b1216807 . _:b1216808 . _:b1216810 . _:b1216809 . "ENVO:00000346"^^ .