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