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