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