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