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