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