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