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