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