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