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