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