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