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