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