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