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