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