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