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