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