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