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