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