input question: Information: - Mathematics (from Greek "mathma", knowledge, study, learning) is the study of topics such as quantity (numbers), structure, space, and change. There is a range of views among mathematicians and philosophers as to the exact scope and definition of mathematics. - A tessellation of a flat surface is the tiling of a plane using one or more geometric shapes, called tiles, with no overlaps and no gaps. In mathematics, tessellations can be generalized to higher dimensions and a variety of geometries. - In geometry, the triangular tiling or triangular tessellation is one of the three regular tilings of the Euclidean plane. Because the internal angle of the equilateral triangle is 60 degrees, six triangles at a point occupy a full 360 degrees. The triangular tiling has Schlafli symbol of {3,6}. - In geometry, the Schlafli symbol is a notation of the form {p,q,r...} that defines regular polytopes and tessellations. - Space is the boundless three-dimensional extent in which objects and events have relative position and direction. Physical space is often conceived in three linear dimensions, although modern physicists usually consider it, with time, to be part of a boundless four-dimensional continuum known as spacetime. The concept of space is considered to be of fundamental importance to an understanding of the physical universe. However, disagreement continues between philosophers over whether it is itself an entity, a relationship between entities, or part of a conceptual framework. - In geometry, a hexagon (from Greek "hex", "six" and , "gonia", "corner, angle") is a six sided polygon or 6-gon. The total of the internal angles of any hexagon is 720. - Geometry (from the ; "geo-" "earth", "-metron" "measurement") is a branch of mathematics concerned with questions of shape, size, relative position of figures, and the properties of space. A mathematician who works in the field of geometry is called a geometer. - In mathematics, a regular polytope is a polytope whose symmetry group acts transitively on its flags, thus giving it the highest degree of symmetry. All its elements or "j"-faces (for all 0"j""n", where "n" is the dimension of the polytope) cells, faces and so on are also transitive on the symmetries of the polytope, and are regular polytopes of dimension "n". - In geometry, the hexagonal tiling or hexagonal tessellation is a regular tiling of the Euclidean plane, in which three hexagons meet at each vertex. It has Schlafli symbol of {6,3} or "t"{3,6} (as a truncated triangular tiling). - In geometry , the snub hexagonal tiling ( or snub trihexagonal tiling ) is a semiregular tiling of the Euclidean plane . There are four triangles and one hexagon on each vertex . It has Schlafli symbol of sr ( 3,6 ) . The snub tetrahexagonal tiling is a related hyperbolic tiling with Schlafli symbol sr ( 4,6 ) . Conway calls it a snub hextille , constructed as a snub operation applied to a hexagonal tiling ( hextille ) . There are 3 regular and 8 semiregular tilings in the plane . This is the only one which does not have a reflection as a symmetry . There is only one uniform coloring of a snub trihexagonal tiling . ( Naming the colors by indices ( 3.3.3.3.6 ) : 11213 . ) Given the information, choose the subject and object entities that have the relation of 'subclass of'.???
output answer: snub trihexagonal tiling , tessellation
Problem: Given the question: Information: - Gob Iron is an American musical group officially formed in 2006 . It consists of Uncle Tupelo / Son Volt 's Jay Farrar and Varnaline 's Anders Parker . Their debut album , Death Songs For The Living was released on October 31 , 2006 by Transmit Sound / Legacy Recordings . Their name comes from a British slang term for a harmonica . - Alternative country (sometimes alt-country, insurgent country, or Americana) is a loosely defined subgenre of country music, which includes acts that differ significantly in style from mainstream or pop country music. It has been used to describe country music bands and artists that have incorporated influences ranging from roots rock, bluegrass, rockabilly, honky-tonk, alternative rock, folk rock, and punk rock. - Jay Farrar (born December 26, 1966) is an American songwriter and musician currently based in St. Louis, Missouri. A veteran of two critically acclaimed music groups, Uncle Tupelo and Son Volt, he began his solo music career in 2001. Beyond his established talents as a songwriter, he is a guitarist, pianist, harmonicist, and a vocalist. - Uncle Tupelo was an alternative country music group from Belleville, Illinois, active between 1987 and 1994. Jay Farrar, Jeff Tweedy, and Mike Heidorn formed the band after the lead singer of their previous band, The Primitives, left to attend college. The trio recorded three albums for Rockville Records, before signing with Sire Records and expanding to a five-piece. Shortly after the release of the band's major label debut album "Anodyne", Farrar announced his decision to leave the band due to a soured relationship with his co-songwriter Tweedy. Uncle Tupelo split on May 1, 1994, after completing a farewell tour. Following the breakup, Farrar formed Son Volt with Heidorn, while the remaining members continued as Wilco. - Son Volt is an American alternative country group, formed by Jay Farrar in 1994 after the breakup of Uncle Tupelo. Given the information, choose the subject and object entities that have the relation of 'genre'.
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The answer is:
gob iron , alternative country