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