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