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