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