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