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