Input (grade 13): Other important rivers and bodies of water in this water-rich province include the Nieuwe Maas, Nieuwe Waterweg, Oude Maas, Haringvliet, Hollands Diep, Oude Rijn and Hollandse IJssel.
Output (grade 10): The most important rivers and other bodies of waters are Nieuwe Maas, Nieuwe Waterweg, Oude Maas, Haringvliet, and Hollands Diep.