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