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