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