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