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pentagons christmas logic angles 2d shapes gerrymandering grids shapes menace balancing taxicab geometry dominos indices ellipses digital clocks dodecagons arrows parabolas games multiples even numbers chalkdust crossnumber square roots division mean ave coordinates multiplication number geometry tournaments polygons bases factorials routes perimeter digits clocks 3d shapes squares hexagons dice crossnumbers functions surds cryptic clues quadratics consecutive numbers perfect numbers range tangents advent addition fractions remainders chocolate planes shape irreducible numbers factors polynomials rectangles percentages cards pascal's triangle time integration volume combinatorics integers determinants people maths sequences proportion averages palindromes unit fractions books cubics crosswords star numbers expansions tiling digital products geometric means the only crossnumber cryptic crossnumbers speed coins sport symmetry binary calculus numbers consecutive integers folding tube maps chess prime numbers trigonometry median probability probabilty matrices products odd numbers colouring spheres square numbers scales axes sums crossnumber lines floors triangle numbers graphs quadrilaterals complex numbers regular shapes money area albgebra algebra circles geometric mean dates rugby sum to infinity sets triangles decahedra elections wordplay differentiation doubling cube numbers partitions means