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