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