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