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