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