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