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