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