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