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