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