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