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