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