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