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