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