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