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