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