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