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