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