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