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