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