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