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