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