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