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