In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

Input: Consider Input: A maximum independent set for this data structure can be found in linear time by adding alternating levels. In this structure, any two vertices or nodes must be connected by a single simple path, and thus it is connected and acyclic. By using (*) union-find with disjoint sets, one type of this structure containing all the vertices of a connected graph can be constructed. One variety of this data structure can be used to easily implement a binary search. This structure also comes in red-black and self-balancing-binary varieties. For 10 points, identify this data structure from computer science, a hierarchical graph in which "leaf" nodes ultimately flow from a "root" node.

Output: Science


Input: Consider Input: This man's works have inspired Derek Walcott's The Isle is Full of Noises and Tom Paulin's The Riot Act. He discussed the pain of having one's hair forcibly shorn in a play about the daughter of Salmoneus, Tyro Keiromene. The work Ichneutai, or The Tracking Satyrs, is a rare example of a satyr play by this tragedian. Anthony Hecht mentioned a girl who had read him in a good translation in his "Dover Bitch," but he's better known for a work in which Eurydice kills herself after the deaths of her son and niece and another in which a Theban queen marries her own son. FTP, name this Greek dramatist who wrote Antigone and Oedipus Rex.

Output: Literature


Input: Consider Input: 21 (Tiebreaker). This law applies when the compressibility factor is equal to 1. It is expressed in the first term of the virial equation, and it is most accurate at high temperatures and low pressures. Deviations from it due to particle volume and intermolecular forces are accounted for in the(*) van der Waals equation, and its namesake entities are described by kinetic theory. This law's namesake constant is equal to Avogadro's number times Boltzmann's constant. For 10 points, name this law most commonly expressed as P V equals N R T.


Output: Science