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