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