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