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