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