Assertion: seine's tributary | /r/HasProperty | the marne
Facets:
Source sentences:
text: As it enters Paris, it is joined by its great tributary the Marne on the right, and, after traversing the metropolis, it receives the Oise, also on the right.
text: The main tributaries of the Seine are the Aube, the Oise, the Marne and the Eue.