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