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