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