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