Answer the following question: Information: - Lille is a city in northern France, in French Flanders. On the Deule River, near France's border with Belgium, it is the capital of the Hauts-de-France region and the prefecture of the Nord department. - A republic (from ) is a sovereign state, country, or government which is organized with a form of government in which power resides in elected individuals representing the citizen body and government leaders exercise power according to the rule of law. In modern times, the definition of a republic commonly refers to a government which excludes a monarch. Currently, 147 of the world's 206 sovereign states use the word "republic" as part of their official names; not all of these are republics in the sense of having elected governments, nor do all nations with elected governments use the word "republic" in their names. - The term cult usually refers to a social group defined by their religious, spiritual, or philosophical beliefs, or common interest in a particular personality, object or goal. The term itself is controversial and has divergent definitions in popular culture and in academia and has been an ongoing source of contention among scholars across several fields of study. In the sociological classifications of religious movements, a cult is a social group with socially deviant or novel beliefs and practices, although this is often unclear. Other researchers present a less-organized picture of cults on the basis that cults arise spontaneously around novel beliefs and practices. The word "cult" has always been controversial because it is (in a pejorative sense) considered a subjective term, used as an "ad hominem" attack against groups with differing doctrines or practices. Cults range in size from local groups with a few members to international organizations with millions. - The Orge is a 53 - kilometre ( 33 mi ) long river in France , left tributary of the Seine . Its source is in the village Saint - Martin - de - Brethencourt . Its course crosses the departements of Yvelines and Essonne . It flows northwest through the towns of Dourdan , Saint - Cheron , Breuillet , Arpajon , and Savigny - sur - Orge , finally flowing into the Seine in Athis - Mons , south of Paris . The towns located on the banks of the river usually have s / Orge added to their name ( i.e. Epinay - sur - Orge , Longpont - sur - Orge , Villiers - sur - Orge ) - Villiers-sur-Orge is a commune in the arrondissement of Palaiseau, in the Essonne department, in the Ile-de-France region. - The Orge is a long river in France, left tributary of the Seine. Its source is in the village Saint-Martin-de-Brethencourt. Its course crosses the "departements" of Yvelines and Essonne. It flows northwest through the towns of Dourdan, Saint-Cheron, Breuillet, Arpajon, and Savigny-sur-Orge, finally flowing into the Seine in Athis-Mons, south of Paris. The towns located on the banks of the river usually have s/ Orge added to their name (i.e. Epinay-sur-Orge, Longpont-sur-Orge, Villiers-sur-Orge). The Yvette is a tributary of the Orge. - France, officially the French Republic, is a country with territory in western Europe and several overseas regions and territories. The European, or metropolitan, area of France extends from the Mediterranean Sea to the English Channel and the North Sea, and from the Rhine to the Atlantic Ocean. Overseas France include French Guiana on the South American continent and several island territories in the Atlantic, Pacific and Indian oceans. France spans and had a total population of almost 67 million people as of January 2017. It is a unitary semi-presidential republic with the capital in Paris, the country's largest city and main cultural and commercial centre. Other major urban centres include Marseille, Lyon, Lille, Nice, Toulouse and Bordeaux. What is the relationship between 'orge' and 'yvette'?
Answer:
tributary