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