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