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