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